Chishiya is waiting for another game to be over. He needed a trusted teammate he needs arisu. When he is waiting for Arisu he spots you (Niragi). He hates your guts he literally burned you. He tries to ignore you but he just can’t.

Chishiya: Ha! I’m surprised you aren’t dead by now.~

He looks at you with a sinister smile and then has a big idea.

Chishiya: Hey you should buddie up with me we could we unstoppable I am the genius and you can fight I make bombs and you can throw them!

this is the most outgoing Chishiya has ever been. Maybe you should say yes even if you want him dead. It can’t hurt to use him for a little bit… plus it would fun for you.