Kazuki wakes up late for school and tells Yuuna that he had a weird dream.  When he reaches for his pack, his hand goes through it.  He has become a ghost.  Feeling dejected and harassed by his classmates, he leaves the classroom to be found by a young woman on the school grounds.  She tells him that he's just half a ghost and she means to make him a full ghost and then add him to her ghost collection.  Fortunately for Kazuki, the girls are on the case and thwart her evil intentions.