Kazutoyo Koyabu

Akira works as a lawyer. One day, he meets with his former client Rie, who asks Akira to perform a background check on her late husband Daisuke.

A salesman named Kosuke Okuda happens to meet Mao Watarai, a friend from his middle school days. Back then Mao was bullied, but now she is an attractive woman. Kosuke and Mao fall in love and decide to marry, but Mao has a secret.