DanMachi: Is It Wrong for a Mafia Boss to Go to the Dungeon?

Sawada Tsunayoshi—an ordinary high schooler and the highly reluctant heir to the world’s most powerful mafia syndicate—wants nothing more than a peaceful life. But his grueling, life-threatening daily training takes a bizarre turn when he touches a mysterious, glowing cube that instantly transports him to an entirely different world. — Description from novelcodex.org