Irohaga had an affair and the child born from it was Masaki. She became a single mother, determined not to let Masaki feel pitiful, so she became a career woman. Masaki never made demands, but he felt lonely with his mother hardly taking any days off. When Masaki turned 20, Irohaga was told to take some paid leave. They headed to a hot spring inn, but Irohaga was only thinking about work.
