Koharu Fukuura works at city hall. She has ordinary days, where she isn't particularly happy or miserable. Overnight, her life completely changes. Her grandfather collapses, her father is arrested for driving while intoxicated, and her house burns down. She also witnesses her boyfriend having an affair with her colleague. She loses everything that night. Koharu Fukuura is now full of despair. At that time, she meets Doctor Daigo. He raises his 8-year-old daughter Hikari alone and he proposes to Koharu. He is like a prince to her. She accepts his proposal and they enjoy happy days together, but, one day, she commits a vicious crime.