Prologue: I swear I saw...

As a child, Izuku was walking in the forest to be alone and escape certain children who tormented him, but when he went to the nearby forest, Izuku was very surprised to see a dragonidia creature, which upon seeing the boy; he ran-away.

Years later, Izuku tried to find that creature again, and when he was about to give up, he found him injured, and thus began a friendship between a dreamy and strong boy, with a friendly, cute and... violent dragon.