Ultra Maniac

Enigma (1x5)

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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!