One day, as the cherry blossoms fall, an office worker named Koharu Wada crosses paths with the heir to her company, Shinobu Ohka. At first, she is bewildered to suddenly find herself in a relationship with him in exchange for keeping a secret, but the only thing he says he wants from her is to stay by his side. Determined to see him open up and smile again, she decides to throw her whole being into making their relationship work...