Life is like a chess game, just a game, but what if you encounter consecutive disastrous situations, dangerous situations, and deadly situations? A suspenseful mystery unfolds, revealing secrets layer by layer. Long hair entangled underwater, a girl having her face peeled off in front of a mirror, the ferocious and strange "seal man", and an inexplicable shadow in the basement bring chilling coldness to your summer. Reading late at night, the only sound you can hear is your own heart beating... thump... thump...