In a reality where Titans and Giants used to live together with humans and as civilisation grew,they hid out in caves and deserted areas until they learnt to blend into human society before quirks by shrinking to human size and later became long forgotten by humans.Titans and Giants didn't like eachother but Titans and Giabts had beabies but they were slaughtered by their fellows because it was forbidden then so some gitans ran away but were caught and slaughtered except two female one's who became part of human society had one baby each with their beloveds who accepted them for who/what they were and the two babies were called haruhime and Izuku.They were born in human form/size but could gigantify anytime they wanted.Izuku's father's skin was blue like drole in Seven deadly sins and haruhime's father had a fox like quirk.