After receiving bad results from his company's health check, Sato starts jogging before work with his boss, the Oshima couple. However, the clothes he borrowed from Oshima were too tight, rubbing against his sensitive nipples, forcing him to give up early. When his wife Yuka finds out, she is amused by his reaction and ends up tormenting his nipples under the pretext of treatment. Yuka's sadistic side is aroused by Sato's moaning and groaning, and, with her own sexual frustrations, she becomes obsessed with the pleasure of tormenting him. She takes every opportunity to tease him, playing with his nipples...