After being relentlessly teased by Shiho's body in school, Asahi begins to projectile-nosebleed while Nagisa starts to get jealous. Asahi runs away to meet with Yoko when the two see a tiny girl with horns walking by them. Soon, Yoko decides to speak directly with the girl who tells Yoko that she is Akane Komoto, related to their homeroom teacher. Akari, the teacher, then shows up to wrangle Akane back to her office, where Asahi and Yoko learn that Akane is actually a thousand year-old devil with real horns and Akari's great-great-grandmother. Akane also claims that it was thanks to her that the various supernatural characters were allowed to transfer into the same class. Despite Akane's attempts to portray herself as an adult, Yoko keeps baiting her into childish reactions with snacks and claims to be the more mature girl. The two girls then decide to have a "sexy" contest in the empty school gym with Shiho acting as the judge while Nagisa starts tracking mysterious demonic energy from her cat-like spacecraft elsewhere in the city. In multiple contests, Yoko and Akane try to one-up each other to prove their sexiness, except Shiho keeps getting the strongest reaction from Asahi. Finally, Yoko challenges Akane to survive eating awful cream puffs that Mikan made earlier. The contest ends with Yoko and Akane blowing up the gym in a large explosion and sending Nagisa's spacecraft flying from the shockwave.
獅穂が転入してきてクラスはますます大騒ぎ。ここまで揃ったら更におかしな人がいても不思議じゃないと思う朝陽だったが、今度は頭に角をつけている女の子が登場！両手いっぱいにお菓子を持つこの少女は紅本茜と名乗り、紅本先生の身内だと言う。角もただのファッションらしいのだが、朝陽はただならぬオーラを感じて……。
En la escuela las sorpresas no se detienen. ¿Será que Shiragami y Asahi recibirán una nueva y tendrán que guardar un nuevo secreto, o todo será solo una broma?
