Five girls played a spiritual game on the eve of graduation, but they didn't know that the blood mark in the mirror had become a sacrifice contract. When the participants died in strange ways one after another, the remaining survivors discovered that their eighteen-year-old self was forever trapped in the dressing mirror of the old teaching building. The bloody curse spreads with the full moon, and the black shadow in the mirror whispers "the game continues", and the only way to break the situation is to let the fifth "person" of that year personally sew the cracks between reality and the abyss - even if it is staring at the back of your neck through every mirror.
