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...
We heard that Guri-san and her friends 
act as mediators for couples.
Wir haben gehört, dass Guri und ihre
Freunde als Pärchenvermittler tätig sind.
Escuchamos que Guri-san
y sus amigos son mediadores de parejas.
Escuchamos que Guri-san
y sus amigos sois mediadores de parejas.
On a entendu dire que
vous aviez aidé plein de couples.
Abbiamo sentito dire che Guri-san e
i suoi amici fanno da mediatori per le coppie.
Ouvimos dizer 
que vocês conectam casais.
Мы слышали, что Гури и её друзья
сводят влюблённых вместе.