After being in a coma for 17 years, Takafumi’s middle-aged uncle suddenly wakes up speaking an unrecognizable language and wielding magical powers.

The ExWire of True Cross Academy are beset with shock and fear in the aftermath of discovering that one of their own classmates, Rin Okumura, is the son of Satan….

Humans and demons are two sides of the same coin, as are Assiah and Gehenna, their respective worlds. The only way to travel between the realms is by the means…