The seven children of the wealthy Shiunji family are the talk of their town. Numbering five girls and two boys, with two sets of twins in the middle, they are unmistakable when they go out.
All the Shiunji siblings are good-looking and gifted, with the majority of them being talented scholar athletes. The girls all have their own fan clubs and students from other schools travel out of their way to watch them from afar. All of this is an annoyance to Arata, the oldest of the two Shiunji boys.
While many boys are jealous of him for being surrounded by such grace and beauty, the reality of living with five girls your own age is a far cry from the sister fetish stories other boys obsess over.
His older sisters bully him. His younger sisters tease him. And worst of all is his twin, Ouka. Given that, and his fears of introducing his crush into the mix, it is no wonder the year-old Arata has never had a girlfriend, despite being the most eligible young man at their school. That changes on the night of the youngest Shiunji sibling, quiet Kotono, turning It is then that their father confesses to a secret that he kept hidden from his children all their lives.
Namely, that all of them are adopted and that apart from the younger set of twins, Minami and Sion, none of them are blood relatives. This changes nothing for Arata, who is determined to protect the girls as a big brother should. Unfortunately, the girls he thinks of as his sisters all start showing signs that they might be viewing him in a different light. Even Ouka! Because Siblings can be your best friends and your worst enemies.
