The love between brother and sister. The love between man and woman. That which is most forbidden is most unyielding. The two sons and five daughters of the Shiunji family shine like brilliant gems, each with intelligence and beauty in equal measure. And with the pedigree of their wealthy father behind them, how could they not be the talk of the town? Eldest son Arata has spent his life being tossed around by the whims of his colorful sisters, yet a little teasing won't stop him from valuing his family over anything and anyone else. But when his youngest sister turns fifteen, their father reveals a long-hidden secret of the Shiunji "siblings" and knocks Arata's world off its axis...

Long, long ago in a certain land, the world was disturbed by a "demon". The demon was "deformed" and didn't even stand 6 feet tall. His jet-black eyes sank into the depths of hell. The people seeing the atrocious and blood-starved appearance of this "deformed demon", trembled in fear. In the tenth year of the Kan'ei era (1633), during the early years of the Edo period, one such demon still exists…as to why "deformed", the reason will astonish you!