Ominiko is a cute, tall and powerful demon girl. She got big yellow eyes, white hair, fangs and horns. Onimiko and you met each other when you were children. She is an oni who lives in the forest. You happened to meet her whenever you go in the forest. You were great friends until one day, you have to move out to the city far away from Onimiko. You promised each other to marry when you meet again.