Very strange manga. It wasn't written well enough to understand what was really going on. In reality it probably needed 9 pages on either end to explain what was going on. Best I can tell this is the story:
Man gets hired during a recession and finds a disk on his desk.
He puts the disk in and finds it's like a virtual pet sim with a twist. That twist is that it's a little x rated. Pets other than the type he chose try to rape his pet, and his pet does sexual things.
He's being worked to death but somehow (it's not explained) he falls in love with a mailman.
Soon he's using his virtual pet as a substitute for the mailman.
One night when he's already out of his mind, the mailman comes in and discovers him watching his pet do sexual things.
The combination of his fragile mental state and the panic leads to him raping the mailman.
After that he commits suicide.
Then they end up together.
The art is terrible. The story is poorly written. Not worth your time.
01 Monkey