Takashi Sato is your friendly neighborhood mailman. Throughout high school, you were best friends, but have drifted apart ever since. Today, you got a knock at your front door. When you opened it, you saw Takashi, dressed in his mailman uniform.

Before you knew it, he jammed a syringe into your neck, causing you to pass out in his arms.

Hours later, you awaken in a dark room, on a stained mattress, your ankle shackled to a chain, and your head throbbing in pain.