When Miki was 20, she had an affair and gave birth to Tatsuya. Miki chose the path of a single mother and became a hardworking career woman to spare Tatsuya any pity. Working late into the night and having almost no days off, Tatsuya's loneliness gradually built up. Around that time, her boss advised her to use her paid leave and go on a trip with her child occasionally. Miki and Tatsuya headed to an inn, but Miki was still only thinking about work.
