OBA-176 A married woman named Yumi Anno invites her lover to her home and indulges in sex while her husband is away.

Today is the day of the important baseball game for Takayuki, her only son. 'I have an appointment that I absolutely cannot miss today,' Yumi said to her husband and Takayuki as she sent them off, deciding to stay home alone... That 'important appointment' was a secret rendezvous with her lover Shinichi. Moreover, because she didn't want to waste even a second of time, Yumi chose her own home as the location. Then the doorbell rang, and Shinichi arrived. Their 'time-limited unrestricted FUCK' begins from this moment...