Backstabbed in a Backwater Dungeon: My Trusted Companions Tried to Kill Me but Thanks to the Gift of an Unlimited Gacha I Got LVL 9999 Friends and Am Out for Revenge on My Former Party Members and the World

Betrayed and banished to a deadly dungeon, a man uses his summoning power to call forth powerful female warriors. After building his strength for three years, he prepares to return topside and exact vengeance on those who wronged him.