http://tvtropes.org/pmwiki/pmwiki.php/Recap/YuunaAndTheHauntedHotSpringsRafineGirlsAcademyArc
Chapter 20: Yuuna-sama is Watching (From the Sky)
Chisaki introduces Kogarashi and Yuuna to her friend, Kokono Morino, who's a student of the female-only Rafine Girls Academy. Kokono explains how the academy is now haunted by an evil spirit that someone summoned using an ouija game, and that it now poses a threat to the academy's beautiful student council president, Renge Shiratsuyu. Kogarashi and Yuuna join up with Kokono to meet with Renge at the academy, which the president agrees to let Kogarashi perform the exorcism as long as Renge goes with him. Kogarashi and Renge investigate the academy at night when no one's around to find the evil spirit, but are noticed by an old lady that patrols the hallways at night.
Chapter 21: Shiratsuyu-sama's Secret
The old lady patrolling the halls turns out to be possessed by the evil spirit, which it then performs a body-jump into Renge. Her emotions run wild while being controlled by the spirit, which Renge reveals that it was actually her that accidentally summoned the spirit through the ouija game. It turns out that even though Renge goes to an all-girls school where she's always surrounded by girls, she's still interested in one day falling in love with a boy, and played the game hoping that it would tell her the man she's meant to be with. The possessed Renge advancing on Kogarashi lowers her defenses enough to allow Yuuna to push the evil spirit out of her, which Kogarashi catches, and puts the case to rest. The next day, Renge comes clean to Kokono about what happened. They celebrate the academy being back to normal with Kogarashi and Yuuna. Kogarashi informs Renge that he will gladly help out if they run into any more problems.
Tropes
- Childhood Friends: Kokono asked Kogarashi for help due to her connection to Chisaki, who Kogarashi is friends with.
- A Day in the Limelight: Despite being a one-off character, Renge is the main focus this arc. She even gets her name in one of the chapter titles.
- The Reveal: It turned out that it was actually Renge that summoned the evil spirit into the academy.
- One-Shot Character: Renge and Kokono only appear in this mini-arc.
