Ohitoyoshi Boukensha, Tensei Shoujo wo Hiroimashita

Sirius, an endlessly kind C-class adventurer, saves a helpless girl from a monster attack. Ever since then, his life has been filled with unexpected miracles! His wounds are healing all too quickly, and he even has the strength to drive away tyrannical noblemen! Thus begins a happy fantasy starring a kind adventurer and a newly reincarnated girl!

(Source: Square Enix)