Yuri Saeki receives a mysterious letter stating she must have sex with six people within 48 hours or face extreme misfortune. Overcome with anxiety and urgency, she immediately takes action, rekindling intimate relationships with close acquaintances like her childhood friend and swimming coach. In a shocking finale, she ends up in a threesome with male AV actors on a porn set. A tense, heart-pounding sequence of events unfolds without pause.