Yuuna becomes sicker as she's effected by the virus.  Kazuki is determined to help her since he's helped the other girls but not Yuuna and she done so much for him.  He only has two times left and the doctor tells him that he will probably have to use both of them to save her.  He says that only the greatest magician in the world could do it.  In his attempt, he does have to use magic twice and on the last time turns to dust.