The Box God of Another World

Thrown into a world of countless realms, he becomes the young heir of a powerful city clan. Then a plot strips him of his powers, shatters his engagement, and puts his family in danger. A mysterious treasure chest system offers him a way back: every chest holds a new weapon, skill, or surprise. But as academy trials and a sea beast crisis draw him into buried feuds, can he grow strong enough to protect his family?