Tomikawa Yosuke is married to Mizuki. They have a daughter, Shiori, and a son, Ko. Yosuke works as the general manager in the personnel department at a large company, while his wife works as a teacher at a private middle school. Their daughter works as a jewelry maker and their son is looking for a job. The family appears to look like a peaceful family, but, due to an accidental opportunity, the family begins to collapse.