Secret Babysitter -Taking Care of a Grown-Up Man's Sexual Desire-

Seiji has to look for a better paying job to repay the debt his parents left him. Finally he finds one that is to "babysit a boy for a month." He is sent to the half basement of a hospital. There he finds not a kid but an adult man named Kei locked up in the room. Now the weird life of these two men together begins. What is going to happen?