ダンジョンラスボス、上司の女神に放逐された先が地球だったので昔の人生の続きをします (Associated Names)

The boss (the goddess) didn’t know about the final boss’ struggles After (possibly) dying from overwork, the protagonist, Jiro Hasegawa, found himself reincarnated as a dungeon monster in another world. Through sheer effort and continuous evolution, he eventually rose to the position of the final boss, entrusted with guarding the deepest part of the dungeon.…