Trinity Seven, Vol. 19: The Seven Magicians — Kenji Saito

Arata is hit by the revelation of his true identity: Astral Trinity, a being formed from the magical remains of the True Demon Lord! Amid this shocking news, Arata becomes the victim of a curse courtesy of Dis Trinity -- a spell that will activate in three days and rob him of his soul. With little time to spare, Arata must traverse dimensions and find the key to stopping this fate: the Demon Lord's core!