Ao Minato, killed his abusive step father and entered a juvenile reformatory. However, his youngest sister who he had tried to protect committed suicide, and his older sister Akane has gone missing. Ao, who stumbled upon a weird shrine, wished for the safety of his sister, which is the only hope he has left, and swears to God that he will do anything for that ... A new chapter for the blockbuster suspense "Massacre Happy Ending".