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

Sirius, a gentle C-class adventurer, saves a girl named Kukuru from being attacked by monsters. From that day, his ordinary life begins to change! A happy fantasy about a kind-hearted boy and reincarnated girl traveling together.

(Source: Gangan Online, translated)