Yumi leaves home with her husband to attend her son Takayuki's baseball game, leaving her behind to watch the house. But the "urgent matter" she insisted she couldn't miss turns out to be a secret rendezvous with her fuck buddy, Shin'ichi. Wanting to avoid wasting time, she chose her own home as their meeting spot. The doorbell rings—Shin'ichi has arrived. In Yumi's bedroom, their intense, no-limits sex begins, time slipping away as passion ignites and their affair reaches new depths.