Dogs and Heroes Don’t Dress Up

Read Manga Dogs and Heroes Don’t Dress Up / Inu to Yuusha wa Kazaranai / Dogs and the Brave are Not Showy / 犬と勇者は飾らない

Summoned to another world to defeat the demon king, Satou Sousuke, 18 years old and only finished elementary school, is brought back to his world after several years had passed. While unable to find employment anywhere and living off a part-time job, Sousuke encounters a battle between a magician and a demon he thought didn't exist on earth! He easily defeated the demon, so being marked for his power he's involved in Demon subjugation?!