Seikatsu Shuukan The Animation, 性活週間 THE ANIMATION, 성활주간, Sexpérience à rebours, Sister Experience Week
Seikatsu Shuukan 2

After transforming back into a boy, the protagonist finds himself overwhelmed by the insatiable lust of his three older sisters—Mei, Yuki, and Rina—who take turns dominating him day and night. Their playful teasing quickly escalates into relentless passion, each sister claiming him with escalating intensity. But beneath their carnal desires lies a hidden secret, deepening the forbidden bond between them as pleasure and deception intertwine in their twisted, erotic week together.