Shimojou Ryoko makes her living by playing slot machines. Abandoned by her parents when she was very young, Ryoko moved from one relationship to another, always seeking permanency and always disappointed. One day she woke up to find a small boy, Kentai, sitting in her room with a note from her boyfriend Kenji. Kenji, a host, asked Ryoko to take care of the boy for a few days. Ryoko, the person who has always wanted to be loved, is about to find out what loving someone is about...
