S Rank Boukensha de aru Ore no Musume-tachi

Story:

The youngest A-rank adventurer, child prodigy Kaiser, finds three babies who were the only survivor of a destroyed village. Then he decided to give up his job as an adventurer and raise them. Over time, the girls grow brightly and show exceptional talents in fencing, magic and management. However, these girls also seem to love their father, Kaiser!