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Onii-chan Lab.

Onii-chan Lab.

お兄ちゃんLab.

Ikezawa Sumire lives with her three elder brothers: Asagi, Ai, and Kon. They are all incredibly handsome, so much so that even her friends get jealous of her having such attractive siblings. Sumire deeply loves Asagi and Ai, but for some reason, she just cannot bring herself to like Kon. This strange dislike puzzles her, and she wonders what could be the cause.

As Sumire goes about her daily life at home, her feelings toward each brother become more complicated. While she enjoys spending time with Asagi and Ai, her interactions with Kon are always tense and awkward. Is there a hidden reason behind her aversion? Perhaps the truth lies in the bonds they share as adoptive siblings, or in emotions that go beyond simple family affection.

This is a sweet and heartwarming romantic comedy that explores the unique dynamics of a household with three elder brothers and one younger sister. Full of happy and tender moments, the story delves into the joys and challenges of living together, and the unexpected feelings that can bloom in the most familiar places.

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