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RIKU

RIKU is an AI-powered novel writing support service jointly developed by KADOKAWA and Hatena, currently in closed beta application phase. The service is designed to support authors through dialogue rather than generate the work itself, and user works will not be used for AI training.

Synthesized from 5 Yomimono stories · updated Aug 5

KADOKAWA and Hatena announced RIKU, an AI-powered novel writing support service, and opened applications for a closed beta test. The application period runs until 23:59 on Monday, August 17, and is open to people aged 18 and over who are writing novels or want to write in the future. The service is designed not to have generative AI write the work itself, but to support the author through dialogue, helping with character and worldview construction, idea organization, and proofreading and editing.

RIKU operates under the theme "You write the story. A partner by your side," positioning the AI as a companion that listens and helps organize thoughts, while the user remains the main entity writing the story and text. Works created or input by users on the service will not be used for AI learning, addressing concerns about training data. The development combines KADOKAWA's editorial expertise, gained through dialogue with authors, with Hatena's experience in user-generated content services like Hatena Blog.

The two companies previously collaborated on the web novel site Kakuyomu since 2016. The closed beta test will be available on Windows, Mac, smartphones, and tablets, and a free Google account is required to apply.

Key facts

Developer
KADOKAWA and Hatena ↗
Service type
AI-powered novel writing support service ↗
Application deadline
23:59 on Monday, August 17 ↗
Eligibility
People aged 18 and over who are writing novels or want to write in the future ↗
AI role
Supports the author through dialogue, not generative writing ↗
User data policy
Works created or input by users will not be used for AI learning ↗
Platforms
Windows, Mac, smartphones, and tablets ↗
Prior collaboration
KADOKAWA and Hatena collaborated on Kakuyomu since 2016 ↗

Timeline

Synthesized by Yomimono from the cited Yomimono stories below, each itself sourced, then editorially reviewed. Every fact links the story it came from.

Facts

Announced
joint development and closed beta test applications · 2026-08-04
Release
game · closed beta test application period until August 17, 2026 · 2026-08-04

Connections

Produces of
kadokawa, hatena

Structured graph also available as JSON at /public/entities/riku. CC BY 4.0.

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Aug 4

KADOKAWA and Hatena Jointly Develop AI Novel Editor RIKU

KADOKAWA and Hatena announced the joint development of RIKU, an AI-powered novel writing support service, and opened applications for a closed beta test. The application period runs until 23:59 on Monday, August 17, and is open to people aged 18 and over who are writing novels or want to write in the future. RIKU is designed not to have generative AI write the work itself, but to support the author through dialogue, helping with character and worldview construction, idea organization, and proofreading and editing. The service operates under the theme "You write the story. A partner by your side," positioning the AI as a companion that listens and helps organize thoughts, while the user remains the main entity writing the story and text. Works created or input by users on the service will not be used for AI learning, addressing concerns about training data. The development combines KADOKAWA's editorial expertise, gained through dialogue with authors, with Hatena's experience in user-generated content services like Hatena Blog. The two companies previously collaborated on the web novel site Kakuyomu since 2016. The closed beta test will be available on Windows, Mac, smartphones, and tablets, and a free Google account is required to apply.

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