29-sai Dokushin Chuuken Boukensha no Nichijou Episode 1

This story is about Shinonome Hajime, an adventurer of Silver Range. He's dedicated to fulfilling missions from the guild. One day when completing a quest for monster meat, he finds a strange girl named Rirui in a dungeon who's far more trouble than she's worth. Saving the girl from certain death, her story reminds him of his similar past and he takes her under his care… (Source: MU)