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The suspense horror/dark fantasy story is set in Tokyo, which is haunted by mysterious "ghouls" who are devouring humans. People are gripped by the fear of these ghouls whose identities are masked in mystery.

The story revolves around Rin Okumura, a teenager possessing abnormal strength and endurance who, along with his younger twin brother Yukio, was raised by Father Shiro Fujimoto. Soon after Yukio departs to study at the prestigious True Cross Academy, Rin learns that he is the son of Satan, the strongest of all demons.

The story revolves around Mahiro Fuwa, a teenager whose sister was mysteriously murdered one year before, and his friend Yoshino Takigawa. Mahiro is contacted by Hakaze Kusaribe, the leader of the Kusaribe clan who was left stranded on an unknown deserted island by her followers, and agrees to help Hakaze in exchange for her help to find out the culprit for the death of his family.

Suzaku High School student and problem kid, Ryu Yamada, is in a bad mood after being chewed out again by the teacher today. As if his day couldn’t get any worse, he falls down the top of the stairs with honor student, Urara Shiraishi!

Due to an untimely death of one of its members, a once happy and playful group of friends drifted and grew apart. Living their lives separately from each other, they secretly blame themselves for the horrible accident, and never got to move on even after years had passed.