The father of Satoru, who used to be a truck driver, caused an accident due to falling asleep at the wheel, resulting in the deaths of his family of three. Satoru's father was sent to prison, while Satoru and his mother kept moving away... Fifteen years passed since the accident.
"My mother… one day… when I came home from school… she herself… do I need to say more?" Despite feeling uneasy about the persistent job interview from the wealthy Takakura Iori, Satoru accepted a job offer due to its exceptional conditions.
