29-sai Dokushin Chuuken Boukensha no Nichijou

A 29-year-old adventurer, Shinonome Hajime, is silver-ranked and always works hard to give his best. During a mission to gather monster flesh, he finds a mysterious girl named Lily in a dungeon. Though she seems troublesome, Hajime saved her life.  The past reminds him of himself, and for that, he decided to take care of the girl.