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...
Like some ripped boys from the rugby team 
are gonna show up and scrum naked!
¡Si apareciera el equipo
de rugby desnudo, me asustaría!
¡Si apareciera el equipo
de rugby desnudo, me asustaría!
On dirait que des rugbymen nus
en pleine mêlée vont surgir !
Ora ci manca solo che i ragazzi muscolosi del club
di rugby si radunino tutti nudi per una mischia!
Se o time de rúgbi aparecesse pelado, 
eu ficaria doidinha!
Кто знает, а вдруг из-за угла выскочит 
команда по регби в чём мать родила!