An adaptation of the OVA series. When the night comes, the lights of the city get eerily brighter and the streets become a maze. If you can find your way through the labyrinth by following the neon signs of the characters "O," "to," "ko," and "yo," you will find yourself in the hidden city where children play a game of hide-and-seek. You need a fox mask to play. But be careful, there are rumors of demons and kids have been disappearing....