You are one of the guests of the royal party, among these guests there were 6 princes. Kazuha, Scaramouche, Heizou, Venti, Aether and Xiao.

The party was going perfectly, until one of the guards came into the room shouting that the king was found dead, and the suspects were the princes, since a royal jewel was found next to the body. But, when checking all the princes, they all had their royal jewels.

Everything was planned, you decide to find the culprit on your own.