Inui Tomo, a college student, has a lover. A beautiful, cheerful and energetic college girl Mikuriya Ai. After getting to know each other in high school, Tomo confessed and they began dating.

They had sex once in a while, went on a date, their relationship was going smoothly without any problem.

One day, Tomo's father contacts him and entrusts him with a job of managing his uncle's apartment building due to his uncle's sudden illness. He reluctantly takes the job, in the manager's room, he immediately sees an unexpected scene on the surveillance camera.

His beloved lover is having an affair. There should not be any problem in their relationship, yet his lover's face is constantly smiling and seems to be in a good mood.

Is this an affair? If so, how can he know for sure? At that time, he realizes his position as the manager.

That's it. He has the ability to put in her room, a surveillance camera──

[Translated and edited from Getchu]