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Kanojo ga Onii-chan ni Nattara Shitai 10 no Koto

彼女がお兄ちゃんになったらしたい10のこと

Nanase moves into a share house when she enters high school. The house has a special rule: each resident is assigned a family role. The roles are: Maki, a 20-year-old female cop, as the father; Tsugumi, a 10-year-old elementary school student, as the mother; Nanase herself as the brother; and Karin, a 13-year-old junior high school student, as the sister.

Living under this unusual arrangement, Nanase must navigate the daily chaos and comedic situations that arise from her new family dynamic. The mismatched roles and personalities lead to a series of awkward and funny moments as they try to function as a household.

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