The story takes place on the small island of Regalo in the Mediterranean Sea. The island has been protected by a vigilante committee called "Arcana Famiglia". The members of the family have psychic powers gained by a secret ritual. Felicita is a 16-year-old girl who was raised by her strict mother. She visits Regalo to see her father who is the head of Arcana Famiglia. He tells her to become the leader of "Serie of Sword", the arbitrator section of the family. As one of the members of Arcana Famiglia, Felicita interacts with other handsome but eccentric members.