Toki Majutsushi no Tsuyokute New Game: Kako ni Modotte Sekai Saikyou kara Yarinaosu

Synopsis

After 100 years of hard work, the hero, Chrome, has become the world's only Chronomancer. However, by the time he became the world's strongest, all the people and towns he wanted to protect were lost. And so the course he chose... is to go back to his childhood and start his life all over again...?! This is the ultimate story of time-lapse fantasy! (Source: Kadokawa, translated)