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...
So does that mean Akane-san and 
Yuzu-chan's families are rivals?
Soll das heißen, dass Akane
und Yuzus Familie verfeindet sind?
Entonces, ¿las familias de Akane-san
y Yuzu-chan son rivales?
Entonces, ¿las familias de Akane-san
y Yuzu-chan son rivales?
Ça veut dire que les familles
d’Akane et de Yuzu sont rivales ?
Questo vuol dire che le famiglie
di Akane-san e Yuzu-chan sono rivali?
Quer dizer que 
as famílias das duas são rivais?
Так это значит, что семьи Аканэ и Юзу 
соперничают друг с другом?