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Omae wo Onii-chan ni Shite Yarou ka!?

お前をお兄ちゃんにしてやろうか!?

Yoichi has grown up without knowing his parents, but one day he receives news of his father's death. The deceased leaves behind a peculiar testament: Yoichi must choose only one out of five 'little sister candidates' to live with. Each girl has her own quirky reason for wanting to become his little sister, from wanting to laze around together to seeking a match to prove her worth.

As Yoichi meets the candidates—Serene, Tomomi, Sayuri, Yuuki, and Mika—he discovers that each one has more than a few odd quirks. A slapstick comedy of sibling life begins, filled with romantic tension and everyday chaos, as Yoichi tries to navigate this unusual family situation.

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