Around Forty Boukensha, Densetsu to Naru: SS Rank no Musume Kyoukasaretara SSS Rank ni Narimashita

A man was given an SSS rank through strengthening magic from the strongest woman in the kingdom?! One day, Wollfe, an average adventurer, is entrusted with a mysterious baby. Through the retirement funds Wolffe has, the girl - Reminia - quickly grows to be a strong heroine and is called to serve in the royal palace as a "woman of valor". Worried about living so far away from her father, Reminia increases all of Wollfe's physical attack, physical defense, magical defense, speed, and auto-recovery stats to MAX. It's then that the success story about a common old man who becomes a legendary adventurer begins! Source: BookLive