Nakayama Sachi was abandoned by her mother Yumi when she was 5 years old and grew up at an orphanage. Now that she has turned 20, she works a part-time job late night at a supermarket which opens 24 hours. Besides that, drawing pictures is her only emotional refuge. One day, Sachi is accosted by one of the supermarket’s regular customers, Mayu, a 17-year-old girl who has runaway from home. On the first day of their meeting, Mayu comes to live at Sachi’s apartment, and like a stray cat, she ends up staying. Mayu is cheerful but there is something fragile about her, and Sachi cannot thrust her away. A couple of days later, Sachi hears from her uncle, Nakayama Naoyuki, that he has found her mother. Sachi has not met her mother ever since she was abandoned 15 years ago. When she returns to her apartment in a state of agitation, she discovers that Mayu has taken a man in. Mayu’s form mirrors her mother’s and brings back Sachi’s memories of her childhood. She throws Mayu out in anger. However, Mayu comes back shortly. Sachi soon learns about her grave secret, which spurs a reunion with her mother. Sachi and Mayu – two lonely hearts slowly start to draw close to each other