Sumire lives a modest but happy life with her salaryman husband, Kenji. One day, he brings his boss home—and the man turns out to be Sumire's former fuck buddy, with whom she once enjoyed aphrodisiac-fueled sex. He initially acts as if nothing is wrong but secretly slips an aphrodisiac into her drink. The moment her husband falls asleep, he pounces on Sumire as the drug erodes her self-control and drags her back into memories she desperately wanted to forget...