Lover's betrayal sex to be shown through the surveillance camera ~ She loves to go Crazy beyond the screen

"College student Qianzhi had a lover.
A beautiful female college student named Mikuriya Ai who is bright and energetic with a male friend Nori.
After a friend relationship in high school, he began dating with Satoshi's confession.

They had sex and dated once in a while, and the relationship between the two was smooth sailing without any complaints.

One day, my father contacted me, and my uncle's sudden illness forced me to work as a manager of the apartment.
He is forced to take over the job of the janitor half forcibly, but Ji immediately sees an outrageous scene with the camera of the janitor's room.

The apartment that I started to manage was inhabited by the love of my lover.
The surveillance cameras clearly showed him clinging to an unknown man and getting into the elevator.

My beloved lover was having an affair.
Even though there should be no dissatisfaction with the lover relationshipな For some reason the smile is constantly showing a pleasant atmosphere.

is this an affair?　so how do we make sure?
At that time, I realized that I now have a job as a janitor.

That's right.i can put a security camera in her room.