Unrivaled Dungeon Summoner: The Strongest Adventurer’s Demon Army Contract魔物召喚でダンジョン無双　魔王軍と契約した最強冒険者 • The Demon King’s Monster-Summoning Adventurer

Yuki, a young man who lost his family to a Dungeon Collapse, is suddenly cornered by the most powerful Dungeon Boss, Libel, and forced into a contract to become a “Monster Tamer”… With the power to form pacts with all kinds of monsters, he must now set out to conquer every last dungeon!