Mamono Shoukan de Dungeon Musou - Maou Gun to Keiyaku Shita Saikyou Boukensha

Having lost his family to the horrors of a Dungeon Outbreak, a young man named Yuki is cornered by the ultimate dungeon boss—Libel.

Forced into a contract to become a [Monster Tamer], his path is set.

Form pacts with all manner of monsters and conquer every dungeon in existence!