Kanna Sakamaki is 15 years old and the daughter of Karlheinz and Beatrix. She is the sister of Shu and Reiji and the Half-sister of Ayato, Leito, Kanato and Subaru. When Kanna was younger, she was taken to a hospital, because of her current condition. Now she is back and want to live with her Brothers again. How will this end??