Nina and Ayu, accompanied by Tetsushi and Hiroki set out to find the secret room in the school which is supposedly haunted by a ghost! However, only Nina and Ayu know the truth- the room is the location of a coveted Holy Stone! When Maya, Nina's childhood friend, comes into the picture they end up having to race against her to find the Holy Stone!
Nina recibe un mensaje de su abuelo con pistas para encontrar la primera piedra sagrada, que resulta estar en una sala secreta del colegio, entonces Ayu, Nina, Kaji y Tsujiai van a investigar, los chicos quedan dormidos y la piedra sagrada resulta ser una bola de Navidad. En este episodio es cuando se conoce a Maya por primera vez.
