Eiyuu Blanc no Jinsei Keikaku: Daini no Jinsei wa Zatsuyougakari de Onegaishimasu

Blanc, the most powerful Grade-0 adventurer, known across the world as the Black Emperor. After slaying the Black Dragon that plunged the world into despair, he became a legendary hero. And then, he made a shocking declaration: "I'm retiring from being a Grade-0 adventurer." Now walking a new path, Blanc—once hailed as the strongest—takes on humble odd jobs as he begins a quiet journey of self-discovery. From Miku, the creator of The Fruit of Evolution, comes a bold new fantasy brought to life on an epic scale! (Source: Futabasha, translated)