Due to changes in her constitution after giving birth, Riho suffers from hyperhidrosis and is more sensitive than when she was single. After dropping off her child at daycare by bicycle, she hits a pedestrian while returning home. She immediately apologizes, but Nakano, the pedestrian, does not forgive her. He stares at her sweaty chest and makes her show him his house, asking her to show him sincerity. With her weakness exposed, Riho lets Nakano do as he tells her and carefully plays with her nipples, bringing her a sense of freedom and pleasure she has never felt during sex with her husband...