Hinako, a 26-year old office worker, is confused by Itsuki's, her neighbor, gender, whom she thought was a boy when they were a child. Hinako spends her daily life surprised by Itsuki's casual gestures. However, it is actually Itsuki's heart who is pounding the most, having unrequited feelings for Hinako.
Seibetsu Fumei na Chuusei Bokukko to Oneesan is a web manga released on the author's Twitter and pixiv accounts from January 15, 2022 to March 12, 2023, and published in print by Kadokawa on March 23, 2023.
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