Ohitoyoshi Boukensha, Tensei Shoujo wo Hiroimashita: Daikenja no Kago-tsuki Shoujo to Nonbiri Shiawase ni Kurashimasu

Sirius, a C-class adventurer with no special powers, saves Kukuru, a girl who was attacked by monsters in the forest. But her true identity is someone from another world who was reincarnated and given the "Blessing of the Great Sage"!? Sirius begins living with Kukuru, who has nowhere to go. The reincarnated girl loves the ordinary, kind-hearted adventurer. A free and happy fantasy where two people travel together.

(Source: Square Enix, translated)