http://tvtropes.org/pmwiki/pmwiki.php/Recap/YuunaAndTheHauntedHotSpringsSeasideTripArc
Chapter 23: The Over-Aggressive Sagiri-san
It's announced at Yukemuri High that their school trip to the sea-side is just around the corner, but Sagiri remains worried that she doesn't have a swimsuit for herself. Her class 1-3 friend and fellow ninja, Urara Urakata, offers to help with her problem, which they recruit Kogarashi by pretending its another demon slaying mission when in actuality, they just want his opinion of what swimsuit looks good on Sagiri.
Chapter 24: The Sea-Side School and Kogarashi-san
The day of the sea-side school trip arrives. Along the bus ride to the sea, Seri Yanazawa introduces herself to Kogarashi and company as a friend of Chisaki. The Yukemuri High students spend the first day of the trip having some fun at the beach, but are suddenly attacked by a hydra-conger monster. Kogarashi swims deep underwater to defeat it, but in the end, no one believes that a monster attack stopped by Kogarashi actually happened. As a result, Chisaki asks her friends to help with something.
Chapter 25: Chisaki-san's Competition of Courage
With the help of her friends, Chisaki comes up with an idea to have the Yukemuri High students take part in a courage competition. Said competition will be designed in such a way that will prove Kogarashi is a psychic by making it look like he defeated a monster in front of them. The plan ends up falling apart due to Urara taking things a bit to seriously using a summon. However, an actual monster appears when two male students who've been jealous over Kogarashi hanging out with all the beautiful girls unintentionally break a rock that acted as the seal. Kogarashi arrives to protect his two classmates, which the monster quickly retreats back into the seal upon witnessing that the boy is as strong as the woman that originally sealed it. In the end, the two who broke the seal apologize to Kogarashi having seen that his skills are legit.
Chapter 26: Dancing Cheek to Cheek and Yuuna-san
Resting in the student dormitory for the night, Kogarashi and Satoshi are invited to the girls room to stay up and play cards with Yuuna, Chisaki, Sagiri, Urara, and Seri. In order to avoid the teachers, Kogarashi uses his rock-climbing skills he acquired from a past ghost possession to climb up to the girls' floor while carrying Satoshi. While playing cards, the female teacher, Harumu Yumesaki, arrives to check on the room, which Kogarashi and Satoshi hide in the futon beds with the girls. Yuuna's paranormal activity begins to act up out of embarrassment, and forces Kogarashi to jump out the window with Satoshi before being noticed. On the second day of the trip, the students enjoy the day getting ready for the cheek-to-cheek couples dance in the evening. For said dance, Kogarashi decides to partner with Yuuna despite knowing that to the normal students, it looks like he's just dancing with himself. Afterwards, the seaside trip comes to an end.
Tropes
- Beach Episode: Chapter 24 is this.
- A Day in the Limelight: Chapter 23 is this for Sagiri.
- Early-Bird Cameo: Harumu Yumesaki, the female teacher in Chapter 26, gets a lot more focus later on.
- Those Two Guys: A pair of recurring male students that are jealous over Kogarashi hanging out with all the beautiful chicks.
- Training from Hell: Kogarashi can scale building walls due to a past ghost possession who was a rock-climber.
