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...
Why not, Yuzu? I brought this 
swimsuit so he'd stare at me.
Was hast du denn, Yuzu? Ich hab
den Bikini doch extra für ihn angezogen.
¿Por qué no?
Lo traje para que me mirara.
¿Por qué no?
Lo traje para que me mirara.
Mais je l’ai mis exprès
pour qu’il regarde.
Perché no, Yuzu? Ho messo questo costume
 apposta per farmi guardare.
Por que não, Yuzu? 
Comprei este biquíni pra ele olhar.
А почему нет? Я специально для этого
его и надела.