Die Klassenfahrt zur Insel Arubi wird zu einer kleinen Geduldsprobe für Shidou, denn Origami und Touka tun alles, um seine Gunst zu gewinnen. Wenig später gerät er in einen heftigen Sturm: Die beiden Halbgeister Kaguya und Yuzuru streiten sich um die Stellung des einzig wahren Windgeistes – und plötzlich auch um Shidous Zuneigung.
After a very awkward moment in Shido's class where Tohka tries switching genders in an effort to bunk with Shido, the class goes on a field trip to Arubi Island. During the entire trip, Origami and Tohka end up constantly annoying Shido in an effort to win his affections. Meanwhile DEM Industries, an organization with an interest in spirits begins stalking Tohka. Some time later, a massive hurricane appears out of nowhere while Shido and Tohka are on a stroll. Three trash cans strike Tohka, knocking her out in the process while two spirits viciously battle overhead. When Shido tries to intervene, the twin spirits Yuzuru and Kaguya decide that their next battle will be over winning Shido's heart to the latter's dismay. When the two girls follow Shido back to the class holding his arms, Origami becomes enraged over her new competition. As Shido's teacher tries to arrange the girls to be students in the class, Kaguya and Yuzuru explain that they were once one spirit named Yamai and that their contests are in an effort to find out whose personality will stay when the girls fuse and become Yamai once more. Later that day, an incident occurs when the twins drag Shido into the men's bath in an effort to sexually seduce him. Things get worse when Tohka shows up along with the rest of the class.
È arrivato il momento per la classe di Shido e Tohka di andare in gita, nonostante uno strano cambiamento della destinazione all'ultimo minuto. Assieme a loro però, c'è un membro delle DEM, che ha l'obiettivo di tenere d'occhio Tohka.
高校生の一大イベント、修学旅行！
晴れ渡る空！ 輝く太陽！ そして母なる海！
浮かれ、はしゃぐ生徒たち……だが、島には、不穏な暗雲が忍び寄りつつあった。
姿を現す新たな精霊！ そして暗躍するは、新たな敵……！？
修学旅行などお構いなしに、士道に降りかかる苦難の数々！
士道の周囲は、更に混迷を深めていくことに――。
Después de un momento muy incómodo en la clase de Shido donde Tohka intenta cambiar de género en un esfuerzo por unirse a Shido, la clase realiza un viaje de campo a la Isla Arubi. Durante todo el viaje, Origami y Tohka terminan molestando constantemente a Shido en un esfuerzo por ganarse su afecto.
