Imōto wa Shitteiru Vol. 9 Releases in Japan on October 6, 2026
The next Japanese volume of Imōto wa Shitteiru, and what it means for readers of the English edition — from official Japanese bibliographic data and the series' English publication history.
Japan release: October 6, 2026 (pre-order) — 妹は知っている（9）
Volume: 9
English edition: no release date on record yet
Japanese dates come from the National Diet Library, openBD and the Media Arts Database. English dates come from English Wikipedia volume lists (CC BY-SA). Estimates use the median gap of recent volumes and are not official announcements.