A-Rank Party wo Ridatsu shita Ore wa, Moto Oshiego-tachi to Meikyuu Shinbu wo Mezasu. (I Left My A-Rank Party to Help My Former Students Reach the Dungeon Depths!)

Synopsis

"I can't do this anymore!" Yuke Feldio, a red mage, just left his adventurer A-Rank party. After being mistreated as a handyman and ridiculed for five years, he finally snapped! And so began his desolate, unemployed life... or so he thought! Through a stroke of luck, Yuke is welcomed into an all-female adventurer party comprised of his former students!! As they defeat dungeons one after another, Yuke's true strength is gradually revealed! As it turns out, this red mage wields extraordinary magic and skills?! (Source: Kodansha USA)