魔界王子 devils and realist 代理王の秘宝

Based on Makai Ouji: Devils and Realist:

The game has an original story featuring Rashild, a transfer student and the son of an Egyptian diplomat. William and Rashild quickly become friends, but when a mysterious intruder invades the school, they discover the existence of a treasure hidden within the school. William and Dantalion soon begin their treasure hunt, bent on grasping fame and fortune.