Yuuna's father is sending something that may help Kazuki get more magic.  Yuuna goes to the infirmary and sees a package from her father and opens it but the vile inside is empty.  What she doesn't know is that the vile actually contained a strand of the virus that caused the girl in the last episode to die, a madical virus with no cure.  Her father was sending it to the doctor and she opened it by mistake.  One of the effects of the virus is that the person infected has a duplicate created that is the oposite in emotions and feelings.  Now its up to the girls to protect Kazuki from the evil Yuuna without him using any of his magic.