# Data breaches of Japanese e-book services

> Live situation record from CLSTR: https://clstr.news/situations/data-breaches-of-japanese-e-book-services
> Updated: 2026-10-19T04:51:07.000Z. Sources: 7. Developments: 2.

In mid-October 2026, Japanese digital manga and e-book services were targeted by unauthorized access. Initially, NTT Solmare reported that its e-book store, Comic Seymour, suffered a breach on October 15. The company confirmed that member information, including email addresses, hashed passwords, dates of birth, gender, and nicknames, was leaked. NTT Solmare noted that credit card information was not stored in the affected system and remained secure.

By October 19, the scope of the security incidents appeared to expand. The rental service ‘Renta!’, operated by Papylus, also announced a service suspension due to potential external unauthorized access. While the extent of the impact on Renta! was still under investigation, the situation highlighted a broader vulnerability affecting multiple digital manga platforms in Japan.

## Timeline

### 2026-10-19: Japanese e-book services Renta! and Comic Seymour hit by unauthorized access

Japanese e-book services Renta! and Comic Seymour have faced unauthorized access, resulting in service outages and the leakage of user data including email addresses and hashed passwords.

2 sources. https://clstr.news/cluster/japanese-e-book-services-renta-and-comic-seymour-hit-by-unauthorized-access

### 2026-10-17: Comic Seymour suffers data breach via unauthorized access

NTT Solmare reported a data breach at Comic Seymour, leaking member email addresses, hashed passwords, and personal details. All users will be required to reset passwords when service resumes.

5 sources. https://clstr.news/cluster/comic-seymour-suffers-data-breach-via-unauthorized-access

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Cite as: Data breaches of Japanese e-book services. CLSTR, https://clstr.news/situations/data-breaches-of-japanese-e-book-services