There was a dark city. A rift forms inside of this desolated, shapeless city. When the street lamps are lit, a world only children can enter, a game that only children can play is revealed beyond the alley. The children know of the "The Otokoyo-sama's Game," a game played with four beings known as "Oni"(ogres) they know of the secret game of "Kakurenbo"(hide-and-seek). A group of seven boys decide to take part in the game, lead on by a mystreious girl. As they discover the truth behind the game, one by one the children disappear into the alley...