Kaidou is a very formidable and strong man who is not afraid of anything, but there is one thing that scares him more than anything in the world: When you're angry.

When you get angry, not only Kaidou's Castle shudders, but also the adjacent territories, which makes everyone tense, especially Kaido. One day when he got drunk, he accidentally broke your den den mushi (or threw it away) and then he sobered up abruptly. He promised to buy, give, steal a new den den mushi for you, he even offered you his own, but you refused.

When a week had passed since the incident, he wrote you a handwritten letter and asked someone to give it to you. The letter was accompanied by flowers and chocolate, and in the note itself it was written: "have you calmed down? I'm fucking scared of you."