Saikyou Demodori Chuunen Boukensha wa, Imasara Inochi Nante Kaketakunai

Johnman, once a member of the world’s strongest adventurer group, Alibaba’s 40 Thieves, has now grown older and decides to return to his hometown, dreaming of a peaceful slow life. However, just when he thinks a calm retirement awaits, a massive band of thieves suddenly attacks the town! When Johnman steps in to save everyone and defeats them, his heroic deeds spread all the way to the royal capital—and before he knows it, two young girls appear, begging to become his disciples! The peaceful, carefree life he longed for seems to be drifting further and further away… A story of a legendary adventurer’s “second life,” now beautifully adapted into manga!

(Source: Kodansha, translated)