Densetsu no Ryuusou Kishi wa Inaka de Futsuu ni Kurashitai: SSS-Rank Irai no Shitauke Yamemasu!

Elm, the legendary Dragon-Armored Knight who once sealed six demon kings and saved the world countless times... is now a humble villager in the countryside! But what happens when he "accidentally" uses his OP skills...?

(Source: MANGA UP!)