Ok he dies

I have a feeling that his death would be the key in finding out who the mastermind would be.

His killer is not the mastermind but someone who could have been tricked by the mastermind.

I say it's her

Oh and Fumiko steps down the protagonist role and gives it back to Korio. Just so we're on the same page.

My prediction:

Victim: Kaiki Guji - Ultimate Pastry Chef

Blacken: Shynah Moku - Ultimate Construction Worker

(Keep in mind that this is my opinion)