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

Story:

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.