A blog on a mysterious website quickly spreads like wildfire, starting a dangerous online game. At 3:00 in the afternoon, a teddy bear stuffed with rice and nails is sunk into a bathtub. The lights go out and the player is required to stab the bear with the knife, then write their experiences in the blog. But lately the comments have taken a dark, demented turn, as if the players are being possessed.

When her classmate Ritsuko disappears, her friend Ryoko is desperate to find her. When she discovers that Ritsuko was playing a strange game online of hide and seek, she begins to wonder if it could be related to her disappearance somehow. Ryoko then discovers that the game is more sinister than it appeared at first. It is linked to demonology and the supernatural. Will she be able to get past her fears and superstitions to discover what secrets the game of hide and seek might hold?