Watch Black Rat

From Kenta Fuksaku, comes a twisted tale about the lives and deaths of several high schoolers. They receive a message from their friend Asuke telling them to go back to their classroom in the middle of the night. This ordinarily wouldn't be an issue, except for the fact that Asuka was supposed to have committed suicide. The group does as they are told, only to run into a killer wearing a bloody rat mask seeking revenge. Will they be able to uncover the indentity of their mystery murderer and survive til the next morning?