Ernst is scheming to invoke the Gehenna Gate by using the blood of Rin, son of Satan. In order to protect his wounded older brother, Yukio offers to take his place.

Hordes of demons are spilling out of Gehenna Gate! And these intruders from the "Empty World" are now indiscriminately attacking the people of True Cross Academy Town! Meanwhile, on the roof of the school building, Rin has been rescued by Suguro and Shiemi and is starting to come to. What Rin sees when he awakens is...