Why can Haiyao fight?

Because he is invincible. The siren is a character in the TV series "Kamen Rider". He can accurately predict divination and cooperate with a reasonable sneak attack. The skills of Kamen Rider's TV series Caspian Demon are too strong, so you can copy the Dragon Slayer. Kamen Rider's TV series "The Siren" is one of the thirteen knights in the Knight War and the earliest winner of the survival card. But because of his peace-loving personality, he gave the card to Lian. Unlike other knights who fight for their own desires, Kamen Rider Raia in "Transfiguration" and Paul, the protagonist, have the same fighting purpose, both of which are to stop the fight between knights.