Morishita Harumi lives with her husband Amaya Kyohei, but they have not officially registered their marriage. One day, she receives a phone call from the police that her husband has died. She goes to the hospital where Kyohei was sent to. There, Morishita Harumi meets Ogura Kanako and Fujimiya Akane, who both insist that Kyohei is their husband. Both Kanako and Akane have not registered their marriage like Harumi. A will was left behind by Kyohei, leading Harumi, Kanako and Akane to a single mother share house and states that he will leave 300 million yen to the only wife that he loved.