Bokutachi wa Benkyou ga Dekinai!

Synopsis

Kirisu dances her part perfectly, her figure skater training allowing her to memorise Uruka's dance moves. Uruka performs as a brand new character from the idol tv series in a costume Nariyuki managed to create from memory. After the show everyone celebrates, until Nariyuki foolishly pulls a loose thread on Kirisu's already damaged costume, and it disintegrates, revealing her bra. The Thorn Society promise Nariyuki they will help sell Rizu's udon if he helps their play, so Nariyuki mistakenly puts on the caped cat costume in the changing room that should have been worn by Kirisu, causing the teachers to chase him to get it back. With Nariyuki missing the Thorn Society begin hunting him down to get him on stage in time. Kominami sees Fumino being led to the stage, realises Nariyuki is in the cat costume and what is going on, so she shows Nariyuki a shortcut. With Nariyuki absent the Headmaster announces the play will be entirely improvised and asks for a volunteer prince from the audience. All the boys rush the stage to volunteer, forcing the Thorn Society to protect Fumino in a mad brawl. Nariyuki makes it just as part of the stage starts to topple and he manages to save Fumino from injury. He is immediately declared the prince, and to his surprise Fumino kisses his cat mask on the lips.

(Source: Wikipedia)