Saishuu Heiki Yuusha: Isekai de Maou o Taoshita Ato mo Otonashiku Shiteita noni, Ikinari Shokei Saresou ni Natta node Hangyaku Shimasu. Kuni o Sutete Slow Life no Tabi ni Deta nodesuga, Nanka Nariyuki de Shinsekai no Maou ni Narisou desu @COMIC

Ten years have passed since four boys and girls were summoned from another world and defeated the Demon King.Arsal, a former hero who saved the kingdom and now serves in the royal army, finds himself falsely accused of a crime he didn't commit. The king, blinded by peacetime complacency, ignores Arsal's calm reasoning and mocks him as a useless burden, completely forgetting his heroic deeds. Fed up with such foolishness, Arsal abandons the kingdom, grabs his severance pay, and sets off on a carefree journey to enjoy a slow life. However, his overwhelming power makes the world see him as a dangerous threat aiming for world domination!?