Having fun with a colleague in the traditional doggy style. The relationship of the couple gradually faded due to the nature of the work requiring them to come home early and late, but on the contrary, Mizuki met the man next to her more often than her husband, and this friendship became stronger and closer. Gradually, both began to develop feelings for each other, and to maintain the relationship, the office girl Mizuki secretly went home to rest after working hours after lying to her husband that she was working as a salesperson.