クトゥルフ神話TRPG ルールブックPLUS

--Unspeakably convenient! The official Call of Cthulhu TRPG app!--

Over 17 books (weighing over 6 kg!) of Call of Cthulhu TRPG-related content are now in one app!

Enjoy a more fun TRPG life with app-exclusive features such as search and bookmarking.

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An essential app for enjoying Call of Cthulhu TRPG, from beginners to seasoned players!

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--- ・Free introductory content such as "Quick Start Rules" and solo playable scenarios!

-- ・Includes over 18 books, including new and old rulebooks, plus app-exclusive content, providing enough information to satisfy fans!

-- ・Includes over 50 official scenarios, including those found in each book. Some scenarios are only available in the app! *The above information is current as of October 1, 2026.

▼▼Recommended for people like this!▼▼

・Those who want to start playing "Call of Cthulhu TRPG" easily for just one coin (※Subscribing to the 480 yen Light Plan allows you to read the basic "Rulebook")

・Those who want to quickly look up rules by searching during a session

・Those who want to easily carry around and refer to data on mythos beings, spell data, etc.

・Those who want to easily read additional information (sourcebooks) such as "Cthulhu and the Empire" and "Cthulhu Horror Show"

・Those who want to make better use of the rulebook and sourcebooks for scenario creation

・Those who want to enjoy app-exclusive content

▼▼Plan Introduction▼▼

Download and introductory content are free. In addition, you can choose from three plans to suit your play style.

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＼First 7 days free! /
◇Premium Plan
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~Includes sourcebooks and scenario collections! For those who want to fully enjoy "Call of Cthulhu TRPG" ~

Price: 1200 yen/month

Contents: "New Call of Cthulhu TRPG Rulebook", "Call of Cthulhu TRPG Rulebook", "New Call of Cthulhu TRPG Starter Set", "New Call of Cthulhu TRPG Quick Reference", "Cthulhu 2020", "Cthulhu 2010", "Cthulhu 2015", "New Malleus Monstrorum Vol. 1", "New Malleus Monstrorum Vol. 2", "Malleus Monstrorum", "Cthulhu Cult Now", "All About Arkham", "Cthulhu and the Empire", "Lovecraft's Dreamlands", "Keeper Companion", "Cthulhu Fragments", "Cthulhu by Gaslight", "Cthulhu Horror Show", "Miskatonic University", "Quick Start Rule Pack", "Call of Cthulhu TRPG" Extra (◆) and other premium-only content, free content

*Books will be added periodically. All content viewable within the app can be found on the app's "Home screen".

(◆) What is "Call of Cthulhu TRPG Extra"?

This is exclusive content for those who have subscribed to a paid plan. Columns, scenarios, and other content to further enhance your Call of Cthulhu TRPG experience are delivered around the 10th of each month.

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◇Basic Plan
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~For those who want to play both the New Edition and Classic Edition~

Price: 750 yen/month

Content: "New Call of Cthulhu TRPG Rulebook", "Call of Cthulhu TRPG Rulebook", "New Call of Cthulhu TRPG Starter Set", "New Call of Cthulhu TRPG Quick Reference", "Quick Start Rule Pack", "Call of Cthulhu TRPG Extra (◆) and other free content

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◇Light Plan
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~Read the new rulebook! Start your Cthulhu Mythos TRPG journey here~

Price: 480 yen/month

Content: 'New Cthulhu Mythos TRPG Rulebook', 'New Cthulhu Mythos TRPG Starter Set', 'New Cthulhu Mythos TRPG Quick Reference', 'Quick Start Rule Pack', 'Cthulhu Mythos TRPG' Extra (◆) and other free content

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◇Free Plan (Free) (*)
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~Try it for free first~

The free plan includes the "Quick Start Rule Pack," which contains three items: introductory rules, a scenario for solo play, and a recommended scenario, as well as other free content.

▽Content included in the "Quick Start Rule Pack"

"Quick Start Rules": An introductory rulebook for getting familiar with "Call of Cthulhu TRPG." It contains the information necessary to create a "Call of Cthulhu TRPG" character and basic rules sufficient to enjoy a simple adventure.

"Facing the Flames Alone": A solo scenario that can be enjoyed without a Keeper (Game Master). In a gamebook-like format, you can learn about "Call of Cthulhu TRPG" while playing. You can learn the rules.

"The Haunted House": An introductory scenario recommended for first-time Keepers and Players.

▼▼A "Rental Feature" is now available for quick reading whenever you want!▼▼
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◇600 yen/168 hours (7 days) rental
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Some books are available for rental. Please check the rental availability within the app.

* The above content information is current as of October 1, 2026.

▼▼List of Included Books▼▼
Rulebooks
・New Call of Cthulhu TRPG Starter Set
・New Call of Cthulhu TRPG Quick Start Rule Pack
・New Call of Cthulhu TRPG Rulebook
・Cthulhu Mythos TRPG

Sourcebooks
・New Call of Cthulhu TRPG Cthulhu 2020
・Cthulhu Mythos TRPG Cthulhu 2010
・New Call of Cthulhu TRPG Malleus Monstrorum Vol. 1 Creatures
・New Call of Cthulhu TRPG Malleus Monstrorum Vol. 2 Deities
・Cthulhu Mythos TRPG Malleus Monstrorum
・Cthulhu Mythos TRPG Cthulhu 2015
・Cthulhu Mythos TRPG Cthulhu Cult Now
・Cthulhu Mythos TRPG All About Arkham: Complete Edition
- Call of Cthulhu TRPG: Cthulhu and the Empire
- Call of Cthulhu TRPG: Lovecraft's Dreamlands
- Call of Cthulhu TRPG: Keeper's Companion, Revised Edition
- Call of Cthulhu TRPG: Cthulhu Fragments
- Call of Cthulhu TRPG: Cthulhu by Gaslight
- Call of Cthulhu TRPG: Miskatonic University
- Call of Cthulhu World Tour: Cthulhu Horror Show

(※The above list is current as of October 1, 2026)
(※Some books require a paid subscription to view)

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"Call of Cthulhu TRPG Rulebook PLUS" values ​​the opinions of our users. We welcome your comments and feedback.

#CoC Rulebook Plus

■Call of Cthulhu TRPG Official Website
https://product.kadokawa.co.jp/cthulhu/

■App Official Website
https://product.kadokawa.co.jp/cthulhu/app/

■Call of Cthulhu TRPG Official Twitter
https://twitter.com/cthulhumasters/

■Call of Cthulhu TRPG Official YouTube Channel
https://www.youtube.com/c/クチュルフ妙тRPGチャンネル

■Terms of Service
https://product.kadokawa.co.jp/cthulhu/app_terms.html

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【What is Call of Cthulhu TRPG?】

TRPG (Tabletop Role-Playing Game) is an interactive game where each player plays a character they have created and advances the story through conversation with other players.


In the Call of Cthulhu TRPG, a Game Master called the "Keeper" introduces and advances the story, while players act freely, confronting the terrifying threats of the Cthulhu Mythos.

(For more information, please visit the Call of Cthulhu TRPG official website: https://product.kadokawa.co.jp/cthulhu/)