Ore Nante Galge?

A boy who likes playing bishoujo game “Kokorone Heartful” wants to be the protagonist of the game and makes a wish to the gods. A god with wish-giving power had never granted such a wish before and was curious. But the god had no clue how gal games work. Based on on the game’s cover art with female protagonist Kokoro Aihara, the god mistakenly thought he wanted to become the girl.