Ohitoyoshi Boukensha, Tensei Shoujo o Hiroimashita

Sirius is a C-class adventurer whose gentle heart sets him apart in a world where kindness often counts for little. When he stumbles upon a monster attacking a helpless young girl, he throws himself into the fray without hesitation and carries her to safety. It seems like an ordinary act of heroism—until his ordinary life begins to change in extraordinary ways. Almost overnight, unexpected miracles start weaving themselves into his days. Wounds that should take weeks to heal close in the blink of an eye, and his body grows strong enough to drive off the tyrannical noblemen he never could have stood against before. As if fate itself were rewarding his compassion, good fortune now follows him at every turn. The girl he rescued carries a secret of her own—she is a soul newly reborn into this world. Together, the endlessly kind adventurer and his mysterious reincarnated companion set out on a journey of small wonders, in a heartwarming fantasy about the happiness that blooms when a good deed is returned a hundredfold.