Trinity Seven, Vol. 15 The Seven Magicians

Arata's barely two steps into Dante's Gate when he meets a new damsel in distress-Ilia's little sister Okto. The younger Ilias Fragment begs him to travel through the nine circles of hell to rescue her trapped sisters. The Twelve Demon Commanders guard the imprisoned grimoire girls...is Trinity Seven strong enough to take on the monstrous servants of the True Demon Lord!?