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.
There aren't a lot of lucky pervert 
moments like in rom-coms.
Es gab bisher kaum perverse
Stelldichein-Abenteuer.
No hay cosas pervertidas
como en las comedias románticas.
non ci sono quasi mai momenti da commedia romantica
 stile "botta di fortuna del pervertito".
A gente nem teve muitos momentos
 picantes de comédia romântica.