Enigmatic Mamoru lives alone with his poisonous but hauntingly luminous jellyfish. These attractive loners sting whoever gets too close. Yuji, an emotionally unstable young man working at the same factory, is fascinated and influenced by Mamoru. When Mamoru is arrested for murdering his boss, Yuji is devoted to taking care of his jellyfish and, befriending Mamoruﾒs father with an eye to becoming his surrogate son.