As his family takes off for a few days, Seiji finds himself home alone. Well, except for Guri, of course. But the peace of the moment is short-lived when Akane shows up at his door saying she's there to spend the night while his family is away and to claim the kiss that Seiji had promised her. Things only get more complicated as usual when Yuzu and Shikimi show up as well. Things seem to go rather okay until Seiji's younger sister Akua returns home early to find Seiji surrounded by all four girls in a compromising situation and proceeds to scold her brother for his behavior. Curious about the siblings' relationship, Guri drags Akua out shopping to get to the bottom of her brother-complex.
It kind of feels like 
summer camp or something.
Irgendwie komm ich mir
vor wie im Ferienlager.
Esto parece un campamento
de verano o algo.
Esto parece un campamento
de verano o algo.
On se croirait
en voyage de groupe…
Sembra un campo estivo 
o qualcosa del genere.
Parece até um acampamento...
Да уж, прямо летний лагерь какой-то.