Hajimari no Machi no Sodateya-san: Tsuihou sareta Bannou Ikuseishi wa Ponkotsu Boukensha wo Kakusei sasete Saikyou Slow Life wo Mezashimasu The Comic

Alaze, the trainer who was deemed useless and cast out from the hero party, returned to his hometown to heal his broken heart and live a peaceful life. However, one day, a girl appeared before him, asking, "Please, train me!"

(Source: Micro Magazine-sha, translated)