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Release #4 - ONIMAI: I'm Now Your Sister! 4

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Mahiro Oyama was just a normal erotic-game loving dude…until he woke up one morning as a woman! Turns out his mad-scientist little sister, Mihari, tried out one of her new experiments on him…with a disastrous outcome, as far as Mahiro’s concerned! But Mihari is as determined to study him as he is determined to go back to his shut-in, game-playing life, and one thing’s for sure…life is going to get a whole lot weirder from here on out!

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Kodansha
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172 pages
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4: ONIMAI: I'm Now Your Sister! 4
0 views • Aug 27, 2025
Former twenty-something shut-in Mahiro Oyama was transformed into a girl by an experimental drug… and now he's a seventh grader, too! As he adjusts to schoolgirl life, he begins to take interest in girly topics like Valentine's Day, fortune telling, and even fashion and makeup! But can his idyllic new life continue when someone who seems to know his secret confronts him in the ladies' room?!