Can Satou save everyone from the hell they have been sucked into or will he be taken over by the darkness?

This is the story of a girl who dreams of becoming a professional dancer. till she discovers that she has two crippling diseases that bring her dreams to a screeching hault. She refuses to to give up no matter how tired or sick she gets. Her boyfriend helps to keep her spirits up and never stop striving towards her dreams. Although at the same time he reminds her not to over stimulate herself o she wont be able to move or even worse get really sick again.