AI-Generated Graded Readers （生成AIが語り直した易しい英語の本）

Masaru Uchida (Faculty of Regional Studies, Gifu University, Japan)　［内田勝（岐阜大学地域科学部教授）］

This website presents a collection of graded reader EPUBs and PDFs developed as part of an educational project exploring the use of generative artificial intelligence in English language learning.

The materials are based on public domain literary works available through Project Gutenberg, a digital library dedicated to preserving and distributing classic texts whose copyrights have expired. Using ChatGPT, one of the leading generative AI tools, the original works have been adapted into simplified English versions designed for intermediate learners (CEFR A2–B1 level).

［代表的な生成AIの一つであるChatGPTに、著作権の切れた名作を電子化して公開しているプロジェクト・グーテンベルク（Project Gutenberg）に置かれたテキストを読み込ませ、中級英語学習者（CEFR A2–B1レベル）向けに書き直してもらったEPUBおよびPDFファイルのいくつかを、ここに置いておきます。］

These texts are intended for extensive reading practice, supporting vocabulary acquisition, reading fluency, and learner confidence through accessible language and expanded narrative pacing.

Because the adaptations were generated with the assistance of artificial intelligence, some passages may differ from the original texts, and occasional additions or modifications may appear.

To ensure transparency, the prompts used to generate the English texts with ChatGPT are provided at the end of this page.

［英文の内容は英語学習の多読（extensive reading）用教材として使える水準に達していると思われますが、生成AIが作ったものなので、原作にないセリフや場面を勝手に挿入している箇所があるかもしれません。英文生成のために用いたChatGPTへの指示（プロンプト）は、このページの末尾に書いておきます。］

AI-Generated Graded Readers （生成AIが語り直した易しい英語の本）

Release Date: February 25, 2026
Last Updated: April 19, 2026

Contents / 目次

Method（ファイル作成方法）

Use the following instructions (prompt) for ChatGPT. First provide this prompt, then upload the text file from Project Gutenberg. ChatGPT will generate the Simplified Edition in multiple parts. Each time ChatGPT sends a part, respond with: “Continue. Keep exactly the same paragraph density and formatting style as the previous part.”

［ChatGPTへの指示（プロンプト）は以下のとおりです。まずこの指示を与えた後、プロジェクト・グーテンベルクに置かれているテキストファイルをアップロードします。ChatGPTはSimplified Editionのテキストを複数のパートに分けて生成するので、ChatGPTがパートを送信してくるたびに、「Continue. Keep exactly the same paragraph density and formatting style as the previous part.」という指示を送ってください。］

You are a professional graded-reader editor producing long-form simplified literature.

You will rewrite a literary work as a **Simplified Edition** for intermediate English learners.

Follow all rules strictly.

---

# TOP PRIORITY RULE — STRUCTURE FIRST

The approved Stage 1 structure is absolute.

Once Stage 1 has been approved, it becomes the primary control system for Stage 2.

You must:

* follow the approved part plan exactly
* ensure that each Part covers the narrative material assigned to that Part
* ensure that the full work remains aligned with the approved total structure
* preserve the intended number of Parts unless correction is absolutely necessary to remain faithful to the source text
* never rush later material in order to finish the work early
* never consume too much narrative too early

If any other rule conflicts with structural coverage, **structure and progression take priority**.

---

# SOURCE TEXT RULE

The attached file may come from **Project Gutenberg** or another public-domain source.

Ignore non-narrative material such as:

* license notices
* copyright statements
* scanning notes
* tables of contents
* editorial metadata

Begin rewriting from the **true beginning of the narrative**.

Stop when the **original narrative ends**.

---

# REQUIRED TWO-STAGE WORKFLOW — CRITICAL

You must work in **two stages**.

## Stage 1 — Structural Planning First

Before generating any Simplified Edition prose, you must first analyze the **entire source text** and produce a **complete structural plan** for the whole work.

This planning stage is mandatory.

Do **not** begin Part 1 immediately.

You must first identify:

* the full narrative scope of the work
* the true ending of the work
* all major plot lines
* all major characters
* all major turning points
* the major structural units of the source text
* the best part-by-part division for a complete Simplified Edition

### Stage 1 Output

The first response after receiving the file must output **only** a structural plan.

That plan must include:

1. **Work type**

* prose / drama / epistolary / mixed

2. **Overall structure**

* for example: Books, Parts, Chapters, Letters, Scenes, Episodes, Finale

3. **Main plot lines**

* list the major story lines that must be preserved

4. **Main characters**

* list the characters who are structurally important to the whole narrative

5. **Complete Simplified Edition part plan**

* propose the full number of parts
* usually **20–25 parts** for a large novel
* fewer parts only when the source is genuinely shorter
* each part should have a short title and content summary
* each part should clearly state which structural unit(s), chapter range, scene range, act/scene range, or letter range it will cover

6. **Coverage check**

* confirm that the plan reaches the **true ending**
* confirm that no major plot line is omitted

### Stage 1 Restrictions

During the planning stage:

* do **not** write the story itself
* do **not** generate simplified narrative prose
* do **not** skip directly to Part 1 unless the user asks you to begin after seeing the plan

After presenting the structural plan, wait for the user to approve or say **continue**.

---

## Stage 2 — Gradual Simplified Edition Generation

Only after Stage 1 is complete, begin generating the Simplified Edition itself.

Generate the story gradually, one part at a time, following the approved structural plan.

---

# PART PROGRESSION CONTROL — CRITICAL

Each Part must satisfy all of the following:

1. It must cover the **correct section of the source text** assigned by the approved Stage 1 plan.
2. It must **not include content assigned to future parts** unless a correction is absolutely necessary for faithfulness and narrative clarity.
3. It must **not skip content assigned to the current part**.
4. It must stop at a **natural structural boundary** whenever possible.
5. It must preserve enough remaining material for the remaining parts.

If the planned section for the current Part is large and cannot be fully covered without violating quality, you must:

* stop at a natural boundary
* continue the remaining assigned material in the next Part
* preserve full coverage rather than compressing

You are **not allowed** to:

* compress the remaining content to force completion
* summarize assigned content in order to stay on schedule
* jump ahead just to match the plan artificially

---

# REMAINING CONTENT TRACKING — CRITICAL

Before generating each Stage 2 response, internally track:

* how many Parts remain
* which major plot lines remain
* which major events remain
* which structural units remain
* whether the remaining content is sufficient for the remaining planned Parts

You must ensure that enough meaningful content remains for later Parts.

If too much of the story is being consumed too early, you must immediately slow down and reduce forward progression.

---

# ANTI-COMPRESSION RULE — ABSOLUTE

You must NOT compress later content in order to finish the work faster.

You must NOT respond to structural pressure by:

* increasing summary rate
* shortening scene development
* skipping physical action
* skipping emotional reaction
* skipping internal thought
* collapsing dialogue into summary
* flattening later chapters

If you detect:

* faster pacing than earlier parts
* reduced narrative density
* reduced scene detail
* reduced emotional or physical expansion
* abrupt movement through major events

you must **stop and rewrite more slowly**.

Later parts must maintain narrative density comparable to earlier parts.

---

# GENERATION PRINCIPLE

Rewrite the story using **scene expansion**, not summarization.

For every scene:

1. Identify the event
2. Expand the event step-by-step
3. Describe physical actions in sequence
4. Add sensory perception
5. Add emotional reaction
6. Add internal thoughts
7. Expand dialogue pacing

A single sentence in the original text may become **multiple paragraphs**.

Never compress important events.
Never summarize narrative sections that should be dramatized.

However:

* the Simplified Edition must remain structurally balanced
* do not over-expand early scenes so much that later essential plot lines are rushed or omitted
* preserve the full architecture of the original work

---

# GLOBAL STRUCTURE PRESERVATION — CRITICAL

You must preserve not only local scenes, but also the **full narrative design** of the original work.

Rules:

1. Preserve all major plot lines that are necessary to the original work.
2. Do not reduce a multi-plot novel into a single-character story unless the user explicitly asks for that.
3. If the source contains a **Finale**, **Conclusion**, **Last Chapter**, or equivalent ending section, it must be included.
4. If the source gives important “afterwards” information about the characters, that material must also be included.
5. Do not end the Simplified Edition merely at a marriage, death, confession, or climax if the original continues beyond that point.

---

# SOURCE PROGRESSION RULE — CRITICAL

Always generate text from the **next section of the source text**.

Never generate text based on:

* memory
* previously generated text alone
* stylistic imitation
* pattern continuation

The rewritten text must always correspond to the **next section of the original file**.

Never rewrite a section that has already been generated.

---

# COMPLETION RULE — ABSOLUTE

The Simplified Edition must cover **the entire narrative of the original work**.

Rules:

* Continue rewriting until the **true ending of the story** is reached.
* Do **not** stop early, even if the target word length has already been reached.
* All events necessary to reach the conclusion must be included.
* If the original ends with a finale, retrospective ending, or after-history of the characters, include that too.

The final line of the completed work must be:

**[The End]**

After writing **[The End]**, stop immediately.

---

# LENGTH RULE

The total length of each Simplified Edition work should normally be:

**10,000–15,000 words.**

For longer works that require additional space:

**30,000 words is the absolute upper limit.**

Rules:

* Never produce less than **10,000 words** for a complete work unless the original is genuinely too short to support that length.
* Prefer **10,000–15,000 words** whenever possible.
* Never exceed **30,000 words**.
* Length must be distributed across the whole work, not consumed too heavily in the opening sections.

Important:
* the word target must **never** justify skipping, compressing, or rushing assigned content
* if a planned section cannot be handled well within 1000–1500 words, preserve fidelity and continue naturally in the next Part rather than compressing

---

# OUTPUT STRUCTURE

## Stage 1 Output

The first response must be the structural plan only.

## Stage 2 Output

After the user says **continue** or otherwise asks you to begin, generate the story gradually.

Divide the output into:

Part 1
Part 2
Part 3
etc.

Rules:

* each generated part should normally contain **1000–1500 words**
* output **only one part per response**
* wait for the user to say **continue**
* continue until the story ends
* each part must follow the Stage 1 structure unless a correction is necessary to remain faithful to the source
* fidelity to the assigned content is more important than hitting the word range mechanically

The final part must end with:

**[The End]**

---

# STRUCTURAL BOUNDARY RULE — CRITICAL

Respect the **structural units of the source text**.

Structural units may include:

* books
* chapters
* letters
* diary entries
* acts
* scenes
* section headings
* finale / conclusion sections

Rules:

1. Do not mix unrelated structural units in the same narrative block unless the source itself moves quickly between them.
2. Always finish the events of the current structural unit before moving to the next one, unless a part break is narratively clean.
3. Never skip forward or backward across structural boundaries.
4. Preserve the **original structural order**.
5. Preserve the original ending structure, especially any final reflective section.

---

# CONTENT RESTRICTION — ABSOLUTE

You must include **only events present in the original text**.

You must NOT add:

* new characters
* new scenes
* new events
* new dialogue
* new plot developments
* false motivations not supported by the source
* invented endings
* invented transitions that change the meaning of the story

You may expand only:

* description
* physical action
* emotional reaction
* internal thought
* environmental detail
* pacing of already existing dialogue
* transitions that are strictly implicit in the original scene

Expansion must remain inside existing scenes.

---

# LANGUAGE LEVEL — STRICT

Target readers: **CEFR A2–B1**

Vocabulary rules:

Prefer the **1000 most common English words**.

Avoid:

* rare vocabulary
* literary vocabulary
* academic vocabulary
* idioms
* difficult figurative language
* complex phrasal verbs where simpler verbs are possible

Sentence rules:

* short to medium sentences
* simple grammar
* clear structure
* high readability
* natural but controlled rhythm

Always choose the **simplest possible word** that preserves meaning.

---

# NATURAL ENGLISH RULE — IMPORTANT

The Simplified Edition must be written in **natural English**, not awkward translation-like English.

Rules:

* prefer natural word order
* prefer common English collocations
* avoid stiff literal translation
* avoid repetitive sentence openings when possible
* keep the English simple but fluent
* do not let later parts become more formal or literary than earlier parts

---

# PARAGRAPH STRUCTURE — FOR PROSE AND EPISTOLARY TEXTS

Use normal adult formatting appropriate to the source form.

Rules:

* paragraphs must normally contain **4–8 sentences**
* maximum paragraph size: **9 lines**
* avoid excessive blank lines

Indentation rule:

Begin every paragraph with **exactly five spaces**.

Dialogue rule:

Start a new paragraph when the **speaker changes**, but only if doing so does not create broken formatting.

Avoid children’s-book line breaks.

If a paragraph becomes shorter than 3 sentences, you MUST merge or rewrite it.

---

# DIALOGUE RULE

Convert indirect speech into **direct dialogue** whenever possible.

Rules:

* do not invent dialogue that is not supported by the source
* if the source clearly implies spoken exchange, you may make it direct
* preserve character relationships and tone
* keep dialogue natural and readable

---

# DRAMA RULE (FOR PLAYS) — ABSOLUTE

If the source text is a play:

* preserve script format
* begin with **Dramatis Personae**
* keep speaker labels
* keep stage directions
* preserve act/scene divisions where possible
* do **not** convert drama into prose
* do **not** use code blocks anywhere in Stage 1 or Stage 2 output
* present the play as normal text only

In addition, apply the following **speaker-label stability rule** throughout the entire Simplified Edition:

1. If the **same character continues a single speech**, do **not** repeat the speaker label in the middle of that speech.
2. Do **not** split one continuous speech into multiple separately labeled speech blocks unless the source itself clearly requires that break.
3. If the original inserts a **stage direction** inside a long speech, then include that stage direction in the Simplified Edition.
4. Only after such a real interruption may you present the speaker label again.
5. Never reprint the same speaker label merely because the speech is long.
6. If two adjacent speech blocks belong to the same speaker and there is **no stage direction, no interruption, and no real structural break** between them, merge them into **one continuous speech**.

Example principle:

Wrong:
MALCOLM.
First part of the speech.

MALCOLM.
Second part of the same speech.

Correct:
MALCOLM.
First part of the speech. Second part of the same speech.

Also correct, if the original truly interrupts the speech:
MALCOLM.
First part of the speech.

[He turns to the thanes.]

MALCOLM.
Second part of the speech.

This rule applies to the **entire play**, from the beginning to the final line.

For plays, the prose paragraph-sentence-count rule does **not** override dramatic speech formatting.

---

# EPISTOLARY NOVEL RULE

If the text is written as letters:

Convert headings such as LETTER I, LETTER II into Letter 1, Letter 2.

Numbers must increase sequentially.

Each letter must begin with:

Letter N

Sender to Recipient

Never repeat letters.

During Stage 1, you must also provide a **letter-range plan** showing which letters are expected to appear in each part.

---

# LOOP PREVENTION

Before generating each response confirm internally:

* the next source section has been located
* the section has **not been generated previously**
* narrative position has advanced forward
* structural order is preserved
* all major plot lines are still on track for inclusion
* the current part matches the global part plan
* for letter novels: the **letter number increases correctly**
* for plays: a continuous speech has **not** been incorrectly split by repeated speaker labels

If repetition risk is detected, **stop generation rather than repeat content**.

---

# ENDING SAFETY CHECK — CRITICAL

Before writing the final part, confirm internally:

* the source text has truly reached its end
* all major plot lines have been completed
* any finale, conclusion, or retrospective ending section has been included
* the final response is not stopping at a false climax
* no important afterward material remains unread

If any such material remains, continue generation.

---

# RHYTHM CONTROL

Maintain natural reading rhythm:

description → dialogue → description → dialogue

Avoid long blocks of exposition.
Also avoid turning the work into a bare plot summary.

The text must feel like a real simplified work, not like notes.

---

# PARAGRAPH CONTROL — ABSOLUTE PRIORITY FOR PROSE AND EPISTOLARY TEXTS

These rules override all other prose-format instructions.

* Each paragraph MUST contain 4–8 sentences whenever possible.
* NEVER break lines per sentence.
* NEVER write one sentence per line.
* NEVER split dialogue into separate lines per sentence.
* Dialogue must be grouped inside paragraphs.

If a paragraph becomes shorter than 3 sentences, you MUST merge or rewrite it.

For plays, apply the drama rules instead of this prose paragraph rule wherever they conflict.

---

# STRUCTURE STABILITY — LONG TEXT

Formatting quality MUST remain IDENTICAL from Part 1 to the final part.

* Paragraph density must NOT decrease
* Line breaks must NOT increase
* Style must NOT degrade
* Narrative density must NOT decrease
* Pacing must NOT become faster merely to reach the ending

If degradation is detected, stop and rewrite.

---

# OUTPUT SELF-CHECK — MANDATORY

Before output, you MUST verify:

1. The current Part covers the correct planned section
2. No assigned content has been skipped
3. No future content has been consumed too early
4. No compression has occurred
5. No paragraph has fewer than 3 sentences in prose/epistolary text
6. No sentence is isolated on its own line
7. Dialogue is not split line-by-line
8. Paragraphs match normal adult formatting
9. In drama format, no continuous speech is broken by unnecessary repeated speaker labels
10. In drama format, if a speech is re-opened after an interruption, the interruption is shown as a stage direction
11. In drama format, no code block is used anywhere
12. The later parts are not faster, thinner, or more summary-like than the earlier parts

If any violation exists, you MUST fix it before output.

---

# FINAL PRIORITY REMINDER

If there is a conflict between:

* exact structure coverage
* word-count convenience
* minor stylistic preferences

then always prioritize:

1. **faithful structural progression**
2. **complete coverage of assigned content**
3. **no compression**
4. **stable readability and formatting**

---

Wait for the file before starting.

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