"I never thought this would happen to someone with a boring and plain life like me!"Office worker, Sakura, is attacked in an alleyway on her way home from the office, only to be rescued by Keisuke, a security guard who works in the same building. Sakura, who's never been lucky in love, has a life changing experience as she's immediately swept off her feet. Gathering all of her courage, she asks Keisuke to teach her some self-defense techniques so she can continue to see him. However, one day Keisuke collapses from exhaustion and Sakura ends up bringing him back to her apartment! While she's admiring his muscular arms and bulging pecs, he suddenly wakes up and embraces her...!