The season 4 ending theme has 3 girls, and the season 4 story revolves around these 3 girls. By using the same analogy, the season 5 ending theme has 1 girl. It means the entire season is about her. It is still hard to classify her as a "girl". I remember her as a middle age woman from season 4. She still retains dark circles around her eyes in season 5. Her face looks younger. She loses her past traits. She uses to be always look tired all the time. Now, she looks like one of the girls. In season 4, Kurumi found out the "girl" is the fairy of origin. Kurumi neglects to relay the information to Shido. The younger Kurumi only tells Shido to know her current self works very hard to keep him alive. Origami is the same as previous seasons, but her perv symptom becomes less severe right now. Only Kurumi's and Origami's appearance are memorable right now. Having too many girls in the show not only minimize their dialogues, they also become more like side characters.