ONIMAI: I'm Now Your Sister! Omnibus 789

ONIMAI: I'm Now Your Sister! Omnibus 789 by circle GRINP is a digital doujin manga compilation following the humorous everyday life of Mahiro Oyama, an eroge-loving shut-in who wakes up transformed into a young girl. Readers experience a charming slice-of-life story as Mahiro attempts to adjust to life as a middle school-aged girl, navigating everything from new wardrobes to awkward social encounters under the playful supervision of his younger sister. The visual style relies on crisp, highly expressive manga art, featuring moe character designs, dynamic facial reactions, and relaxed layout pacing that accentuates the series' cozy comedy and lighthearted atmosphere. As a digital comic format, it delivers a clean reading experience focused purely on visual storytelling and character interactions. What sets this 156-page omnibus apart from individual releases is its wealth of exclusive supplementary material. In addition to fully collecting chapters 19 through 27 (originally published across doujinshi volumes 7, 8, and 9), this release packs 7 pages of previously unreleased early character setup illustrations and concept sketches, a 5-page bonus manga created specifically for this compilation, and several newly drawn mini illustration cuts.

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