The freshly debuted idol group Marginal#4 dreams of delivering their kisses to the end of the galaxy. Composed of Atom Kirihara, Rui Aiba, and the twins L and R Nomura, Marginal#4 aims to reach the top of the idol world, following in the footsteps of Pythagoras Productions' previous idol group, Lagrange Point. When they aren't performing, however, the boys of Marginal#4 are ordinary high school students. From securing a club room and chasing down missing underwear to filming commercials, their days are packed with various hijinks. As the boys navigate a flurry of events, they try to become shooting star sensations and charm the hearts of their fans, known as the Starclusters. [Written by MAL Rewrite]

Morita Mayu, a high school girl. She is extremely reticent and her silence and habit of looking at people's eyes straightly sometimes cause misunderstanding. The reason behind it is not because she doesn’t like to talk nor because she has nothing to say. The reason she rarely speaks is due to the fact she thinks too much before speaking, thus losing the timing to speak altogether. But she lives a happy school life with her classmates.

Kyoshiro to Towa no Sora revolves around the life of Kuu Shiratori, a seemingly normal high school girl who enjoys her school life in the giant city Academia, which is thought of as a symbol of recovery for humanity since already ten years have passed since the greatest disaster mankind had ever seen, occurred. Kuu has recently been having a recurring dream where a prince meets her and takes her away. One day, while all the students at her school are preparing for the upcoming school festival, the prince, whom she has met several times in her dreams, appears. The prince, Kyoshiro Ayanokoji, requests of her just as he had done in Kuu's dreams, "Let's go... together..."

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. (Source: ANN)