Mika lived happily with her serious husband and honest son, Ryo. One day, her son's friend, Makoto, visited the house. While talking in Ryo's absence, Makoto gradually developed romantic feelings for Mika. Despite his innocent smile and cheerful demeanor, he suddenly attacked her. With no memory of what happened, Mika found herself tearfully responding to Makoto's whispered words, "I'm lonely..." She whispered, "Just this once..." and chose to accept the young man's hard cock. From that day on, the happy life she had carefully protected came crashing down.