Aizawa is a single father who unexpectedly finds himself raising his son, Riku, alone. He strives to be a good parent, but Riku’s actions as an adult cause him concern. Riku has a girlfriend, and Aizawa initially sees her as a positive influence. However, one day, the girlfriend arrives at Aizawa’s home injured and upset. Aizawa, noticing signs of abuse, offers comfort and support, wanting to understand what happened between his son and his girlfriend.