Yuusha ni Narenakatta Ossan Kyuuhei, Jinrui no Shugosha to Naru

Twenty years have passed since the Demon King was defeated. Raina, who had once been summoned as a Hero but lacked the talent for the sword — leaving him able only to watch his companions set off on their journey — now works alone in the royal capital as an archer, ceaselessly picking off monsters. Then, a young girl named Ariana appears before him as the new Hero, bringing news that the Demon King is poised to return. Burdened by regrets from his past, this middle-aged archer rises up once more — this time as a true Hero and a guardian of humanity!