2026 Reading Challenge

お兄ちゃんはおしまい！ 単行本版 Series

9 primary works • 9 total works
Associated Names:
不當哥哥了！

Book 1

ONIMAI: I'm Now Your Sister! 1
by
4.33 · 145 Ratings · 7 Reviews · published 2018 · 4 editions
Mahiro Oyama was just a normal erotic-game loving …

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    Book 2

    ONIMAI: I'm Now Your Sister! Vol. 2
    by
    4.49     · 100 Ratings · 4 Reviews · published 2019 · 4 editions
    One day, loser shut-in Mahiro was suddenly transfo…

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    Book 3

    ONIMAI: I'm Now Your Sister! Vol. 3
    by
    4.43     · 88 Ratings · 2 Reviews · published 2019 · 5 editions
    Former shut-in Mahiro Oyama was transformed into a…

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    Book 4

    ONIMAI: I'm Now Your Sister! Vol. 4
    by
    4.44     · 77 Ratings · 1 Reviews · published 2020 · 1 edition
    お兄ちゃん、身も心もJCに!?

    怪しい薬で女の子になってしまった元引きこもりの青年・緒山真尋。
    JCとし…

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    Book 5

    ONIMAI: I'm Now Your Sister! 5
    by
    4.39     · 76 Ratings · 1 Reviews · published 2021 · 5 editions
    This brother has girl power of monstrous proportio…

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    Book 6

    ONIMAI: I'm Now Your Sister! 6
    by
    4.40     · 62 Ratings · 1 Reviews · published 2022 · 1 edition
    It's his first summer break as a schoolgirl! Forme…

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    Book 7

    お兄ちゃんはおしまい! 7 [Oniichan wa Oshimai! 7]
    by
    4.03     · 31 Ratings · 1 Reviews · published 2023 · 4 editions
    ひょんなことから女子中学生になってしまった
    元引きこもりの青年・緒山真尋。
    人生2度目の中学2年生の夏休…

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    Book 8

    ONIMAI: I'm Now Your Sister! Vol. 8
    by
    4.58     · 45 Ratings · published 2023 · 2 editions
    Big brother has nearly mastered the feminine mind!…

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    Book 9

    お兄ちゃんはおしまい! 9 [Oniichan wa Oshimai! 9]
    by
    4.50     · 4 Ratings · published 2024 · 2 editions
    謎の薬の効果で女子中学生になってしまった元自宅警備員の緒山真尋。
    それでも順調にJC生活を満喫していた…

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