Shiro ● Yumi who divorced her husband when she was a student and raised Shiro by herself. - She managed to get Shiro into college, but Shiro didn't get used to it and dropped out. - Since then, Shiro, who hasn't been motivated to do anything, earns daily money from the current trendy home delivery service using the Internet. - Yumi invited Shiro to go on a hot spring trip, saying that she shouldn't stay like this.