Mi-ja, who has been taking care of a retired teacher, Ms. Park, invites several of her former students to her house 16 years after their graduation. Since the end of her teaching career, Park has been residing in the countryside, suffering from an illness while an ex-student, the kind and pretty Mi-ja cares for her.

Detectives are thrust into a chilling hunt for a sadistic serial killer from the past whose return marks the beginning of a new wave of grotesque, otherworldly crimes tied to a cosmic force.

In Tokyo, Japan, several grotesque murders take place on rainy days. Detective Sawamura, who is in charge of the case, soon discovers that his own family is connected to the crimes.

A troupe of struggling stage actors is rehearsing for a small-town production of a play. Everything seems to be as it should until one of the cast members turns up dead. In a panic, the others try to get out, only to find they are now locked in the theater with the killer! Which one of them committed the murder, and who will get out alive?

某個工地有具被狗啃食的屍體，
警方將三隻啃食屍體的狗關進收容所後，
自狗嘴中吐出一張寫著「狗食之刑」的字條。
在此同時，一名啃老族的宅男在大廈頂樓被殺害，
身體多處被割下來放置在一旁的水桶裡，水桶旁
疑有一張兇手留下「體會為母之痛之刑」的字條。
而這兩名被害者的共通點是擔任同一案件的裁判員!!
負責此案件的澤村久志驚覺到自己的老婆也是
其中一名裁判員……