The strongest S-rank explorer. Back to school days for an unbeatable youth!!

The strongest S-rank explorer, Akizuki Yuito, was suffering from loneliness.

Regretting his solitary life and wishing for a "redo of his youth," he destroyed the dungeon's core and when he came to, he found himself back before his first year of high school.

As Yuito, now back in the past, began to resolve his regrets from his student days, he started to interact with beautiful girls he had never been able to talk to before...