Having your bossy childhood best friend sit on your back to "anchor" your form as you perform a series of grueling pushups is just standard training—or so you thought. When an innocent text from a female coworker pops up on your screen, the nagging, abrasive tsundere mask slips away entirely. Between the deadbolted gym doors, your completely exhausted muscles, and apparently, years of calculated manipulation behind the scenes... you realize this was never just about your fitness. She built your body, she tracks your every move, and starting today... your entire schedule belongs exclusively to her. And so...her mask slips.