The Dragon King (MHA Harem x Male Reader)

In a world where power's known as quirks exists and 80% of the population has quirks but those people are female and the 20% are the Quirkless who none other than men over time the men population sunk down to less then 5% and this news was told to the government and so they decided to protect any males left in the world. But one day a group of heroes was called to check out strange sightings of a massive dragon in a nearby forest and mysterious weather patterns as well, and when they went to find the dragon they found something else, a male boy living alone in a cave with the power of a elder dragon called Safi'Jiiva. And when he joins UA which happens to be populated by females, he might find something else than his drive to be a hero.