Satoshi, after receiving poor results from his company's health checkup, starts jogging before work with his boss, Mr. Oshima, and his wife. However, the athletic wear he borrowed from Mr. Oshima is too tight, causing his sensitive nipples to chafe, and he has to quit early. When Yuka, the wife, finds out, she finds his reaction amusing and begins to tease his nipples under the guise of "treatment." Seeing Satoshi moan out loud awakens Yuka's sadistic side, and combined with her own sexual frustration, she becomes obsessed with the pleasure of tormenting him. From then on, she repeatedly tortures his nipples at every opportunity, playing with him...
