[Family - the smallest group of humans that can be both bonds and chains.] Junpei has decided to marry Akutsu Minami, a beautiful woman who lives in a luxurious mansion, and has become a son-in-law to the Akutsu family. There are strange household rules, a creepy basement, and a series of disappearances happening behind the scenes. This happy "family" is harboring a terrifying madness.