Hordes of demons come through the Gehenna Gate, torturing everyone until the Esquires come up with a plan to open a gate to the Vatican, where it is daytime, and reflect the sunlight from there back to the Academy, where it is nighttime, to weaken the monsters. Rin and Yukio seize this opportunity and combine their demonic powers, destroying the Gehenna Gate. One month later, things are back to normal at True Cross Academy and the twins pay a visit to their mother's grave before returning to their duties as Exorcists.