Rinrin is the mechanical genius of the sisters and is always hard at work with her inventions. Early on, one of her creations that we meet is Mecha-Rinrin, a giant robot that usually accompanies her. She definitely has a talent for machines and anything mechanical as she makes messenger phones, a submarine, and is even in the process of creating a robot replica of herself.    In Sister Princess Repure, she teams up with Yotsuba to form a detective duo to find out details about their big brother that they don&#039;t know. Unfortunately, this takes away from really showing her amazing skills as an inventor that are prominent throughout the first Sister Princess anime series and in the original stories.    Like all of her sisters, she really puts her heart into her work, as she wants her brother to be happy. And of course, any help and encouragement that her brother Wataru can give her always puts a smile on her face.

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)

After a long time, Wataru has decided to leave the house and lives on his own. The girls have also decided to split up and most of them are living seperately as well. But none of them has forgotten about their brother and they still stick together to meet him, or their sisters.

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)