A japanese visual novel.

Arcana Famiglia is a self-appointed organization whose members have mysterious powers. They use these powers to protect a small Mediterranean island, Regalo, from pirates, foreign countries, and other threats. The members are all extremely loyal and devoted to the Family's leaders, being: Mondo, the boss, Sumire, his wife, and Felicità, the daughter and main heroine. The story is focused on the only daughter of the "Papà": Felicità, will be married to the next head of the family in two months — and the successor will be decided in a competition that Felicità herself will take part in.

The heroine spent her childhood days in a lonely, remote place with her mother, Sumire, and her servant/subordinate, Luca. The Christmas she turned 16, she was invited to go and live together with her father, Mondo.

The dream she had ever since she was young was to live a happy life with her family together. Thus, with her long-yearned-for dream coming true, she took her first steps as a member of "Arcana Famiglia", a vigilante organization the frank Mondo is in control of.

The story takes place 3 months after that, on April 1st.