Karen, a returnee student, stays over at her friend Junya's house, where Shota accidentally discovers her secret. Blackmailed and forced into submission, Karen is made to endure escalating sexual acts—her big tits groped freely, a strapon and a real cock penetrating her one after another. Soon, she begins actively begging for cock, revealing a surprisingly eager side. Captivated by her allure, the situation spirals even deeper into depravity.