Rin's boyfriend, Ichiro, is always troubled by his inability to achieve a semi-erect erection during intercourse. One day, he witnesses Rin being approached at their date location, which arouses him intensely. Realizing he has NTR desires, he seeks help from his friend, AV actor Kenji, hoping to have sex with Rin while fully erect. He arranges for Kenji to "steal" Rin, allowing them to have passionate sex without his knowledge, including unprotected intercourse.