Oogami Island is normally a peaceful isle with lush green scenery, but is now a place of depraved wanton lust. The contagion Unknown - Level 4 has become epidemic. 3 girls, Hyuuga Natsu, Ochi Akari, and Hanazawa Airi find themselves trapped in a sports facility where they are assaulted by the infected.

A mysterious fire and a bullied girl committing suicide led her brother (Ryou Tezuka) to take matters into his own hands.Kidnapping three girls -- Yukawa Ayano, Inami Misuzu, and Tsubaki Rina -- he rapes and tortures them to extract information on why they had to bully his sister? Why did she have to die?Misuzu Inami is a model that does well, Ayano Yukawa works as an actress in public entertainment, and Tsubaki Rina seemed to be his younger sister's best friend.There is also the mystery of a journal hiding a dark past...