Kisaragi Sarasa, a talented and charming honor student, struggles to control her escalating desires and frequent nosebleeds. As her younger brother Kira joins the same school, she plans a celebration by inviting him to her room, with the intention of sharing her first intimate experience. Unaware of her true intentions, Kira enters the room without suspicion. In her see-through negligee, she eagerly approaches her brother, her eyes filled with lust and her breasts prominently displayed. The stage is set for an intimate and forbidden encounter between siblings during the school swim meet.

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