The family's second son Takanori was roped in to commit the robberies by his gangster father Tetsuji, hysterical mother Naomi, and elder brother Satoshi, as the family was in financial trouble due to debts and the mandatory contributions to the gang. However, things got out of hand and led to the multiple murders in order to achieve their aim. ~~ based on the book "Wagaikka Zenin Shikei" written by Suzuki Tomohiko.