Who killed the Master?

You are a servant in the McMiller house, along with four others- Butler Jones- your best friend, Gracie, Miller, and Kaden. You were on an errand for Master Yoko, the creed, harsh, cold Master who you disdain. However, when you return from your errand, Master Yozo is found dead. You need to figure out who did it before time runs out and you are convicted!