B-Rank Adventurer With an Evil Look Becomes a Daddy to the Protagonist and His Childhood Friends

B-grade adventurer Grey was an NPC in the RPG “Bright Fantasy”
… or he was supposed to be.
He saves an orphan from an attack by a ruffian, and decides to raise the boy as his own. That orphan was Bright Fantasy’s protagonist, Isuka…
His choice will greatly change the fate of the world.