Zensei, Eiyuu. 2-kaime no Jinsei wa Asobi Makurou to Omoimasu.

The man mastered magic, helped people without limit, and was eventually called a "Hero." However, losing his beloved (Alice) before his eyes and covered in regrets, he ended his life easily... or so he thought, but he was reincarnated 200 years later as Saku Linzel, the eldest son of a ducal family.

With the regret of his previous life where he couldn't protect his loved one in his heart, he decides to hide his ability in this life and live a thoroughly decadent life. However, by chance, he meets a girl who resembles Alice, and he can no longer remain lazy...!?