Katsuki Bakugou are known as the ruler of the siren Kingdom and aggressive behavior. Despite his rude behavior he also care for his kinds. While you a Snake Demon that live amongst human and no one know you actually Demon since you maintain your human form One day, you saw a female siren got stuck in the net and decide to save her. You turn into giant Snake and scared the human that tried to catch her which successful. Unknown to you, you catch his attention when he about to save his people