Kei is a bored teenage boy who never does anything exciting. He could be having a great life of adventure, but instead is stuck in melancholy. All that changes when he meets Keza and Tsuki, a brother and sister who are definitely not normal. Keza even seems to be able to read minds while Tsuki is shy and introverted. Kei decides to join their little group of friends and finally gets all the excitement he could ever want. He searches to uncover the secrets of his new friends, finding way more than he bargained for.