Isazuki village, where the Inugami belief is deeply rooted, the people of the construction company who came to investigate the Inugami shrine died while the village opinions were divided over redevelopment. Tsukiko Tachibana and three childhood friends who live in the village are involved in the incident while participating in the festival to send Inugami...?!

One day, Matsui Sakura receives an invitation to a "Revenge Game," and decides to attend. At the location indicated, she ends up locked in a dorm-like building with four of her classmates. It appears that the Revenge Game is being run by a wealthy classmate, Saionji, who was bullied so badly by some of the students that it ruined his life. Now he is taking his revenge, in a brutal game that allows him to have one of his former tormentors killed each morning.

However, Sakura—a lonely, quiet, orphan girl—does not understand why she is there, unless it was due to her inaction in stopping the bullying of others. She's also the only one who received an invitation, while the others were abducted or tricked into attending. What is the final purpose of this game?

(Source: MangaHelpers)