The time has stopped in the Scarlet mansion enshrouded in darkness. A little girl, named Sakuya, was chased out of the human village because of her unusual abilities. The meeting of the two has brought changes for the Scarlet mansion and Sakuya has found a place to be. However, the flow of the peaceful days is smashed into pieces by those two humans.

And the reason for the scarlet mist to appear in the mansion was...