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...
while Akane-tan's Hiyama 
family are the spears.
Akane und die Hiyama-Familie
sind der „Speer“.
Mientras que los Hiyama
de Akane-tan son la lanza.
Mientras que los Hiyama
de Akane-tan son la lanza.
et les Hiyama sont la lance.
Mentre la famiglia Hiyama di Akane-tan è la "lancia".
E a família Hiyama, 
da Akane-tan, é a lança.
Ну, а семья Аканэ Хиямы —
мечи, такие дела.