Yotsuba can best be described as chirpy, cheerful, and full of curiosity, as she wants to know all of her brother&#039;s secrets. This little detective is never anywhere without her magnifying glass, as she&#039;s always checking things. Her signature phrase&quot;checki&quot; always comes up when she&#039;s investigating something very interesting.    Yotsuba comes from England and is one of the three new sisters that made her first appearance in 2000 in Dengeki G&#039;s magazine and the first Sister Princess game.    In Sister Princess RePure, she brings up an interesting point about how much all of them really know about their brother. She teams with Rinrin in order to find out more about him, and like the rest of her sisters, wishes to become closer to him.

Wataru Minakami is a top student who failed his high school entrance exam because of a computer glitch. He later discovered that he was accepted to Stargazer Hill Academy, which is located at a mysterious place called Promised Island. At the request of his father, Wataru is whisked away to the island, and before he can settle in, a dozen of cute and charming girls start to flock him and claim to be his younger sisters. As Wataru gets closer to his newfound siblings, a deeper mystery as to why they were sent to the island comes to play. <br><br>
(Source: Anime News Network)

Wataru Minakami is a top student who failed his high school entrence exam because of a computer glitch . He later discovered that he was accepted to Stargazer Hill Academy, which is located at a mysterious place called Promised Island. At the request of his father, Wataru is whisked away to the island, and before he can settle in, a dozen of cute and charming girls start to flock him and claim to be his younger sisters. As Wataru gets closer to his newfound siblings, a deeper mystery as to why they were sent to the island comes to play.<br><br>(Source: Anime News Network)