Summer vacation! Seiji, Guri, Akane and Yuzu have invited Akua to go with them to the beach. Akane tries to get Akua to go swimming with her in attempt to get closer to Seiji's little sister, but Akua gives her the cold shoulder. Pouting at her brother and his harem Akua goes to swim by herself but a dark shadow looms beneath her. Meanwhile, summer also means tests of courage! Guri suddenly invites Seiji, Akane, and Yuzu to the school after dark for a test of courage but her real motives are to pair another young couple who have asked for her help. Seiji thinks something isn't quite right about the pair though...
I won't give up. We will 
become friends! You'll see!
Ich gebe nicht auf. Wir werden
um jeden Preis Freundschaft schließen!
¡No me rendiré
hasta que nos llevemos bien!
¡No me rendiré
hasta que nos llevemos bien!
Je ferai tout
pour sympathiser avec elle !
Non mi arrenderò,
finché non andremo d'accordo!
Eu não vou desistir até virarmos amigas!
Я не сдамся!
Мы с ней подружимся, вот увидишь!