Masaki is the child Iroha had an affair with. He became a single mother and raised Masaki, and became a career woman because he didn't want him to feel sorry for him. Masaki didn't say anything selfish, but his mother, who rarely took a break from him, was getting lonely. When Masaki reached the age of 20, Iroha was told that he should use his paid leave from time to time. She heads to a hot spring inn with Masaki, but Iroha is only thinking about work.
