Whispers and tales spread like wildfire in any high school. From juicy scandals to heartwarming gossip and sinister secrets. Among these tales, there is one that captures the imagination of Hiroshi and his buddies Mika, Takeshi, and Takurou. It involves a supposedly abandoned mansion just outside town, rumored to be haunted by monstrous creatures. Despite the possible dangers, the group can't resist the call to explore and test their bravery. Full of trepidation, each one enters the mansion, only to find a violent blue creature named Ao Oni inside. Their goal is to uncover the mysteries of the mansion and survive the ordeal, but this proves to be more difficult than expected. Hiroshi and his crew must evade the new monster and fight for their lives. However, the road ahead is filled with numerous grisly endings that none of them could have foreseen.