Denji has a simple dream—to live a happy and peaceful life, spending time with a girl he likes. This is a far cry from reality, however, as Denji is forced by the yakuza into killing devils in order to pay off his crushing debts. Using his pet devil Pochita as a weapon, he is ready to do anything for a bit of cash.

World peace is at stake and secret agent Twilight must undergo his most difficult mission yet—pretend to be a family man. Posing as a loving husband and father, he’ll infiltrate an elite school to get close to a high-profile politician. He has the perfect cover, except his wife’s a deadly assassin and neither knows each other’s identity. But someone does, his adopted daughter who’s a telepath!