After Keita Suminoe's mother passed away, his father promptly remarried, introducing two step-sisters into Keita's life: twins Ako and Riko. But since their fateful first encounter, a surge of incestuous love for their younger brother overcame the girls, beginning a lifelong feud for his heart. Now at the end of his middle school career, Keita studies fervently to be able to attend Ako and Riko's high school. While doing so however, he must resolve his conflicting feelings for his siblings and either reject or succumb to his sisters' intimate advances. Fortunately—or perhaps unfortunately for Keita—his sisters aren't the only women lusting after him, and there's no telling when the allure of temptation will get the better of the boy as well. [Written by MAL Rewrite]

One morning, Wataru Hoshino found a sleeping girl—in nothing but her underwear—in his room. When she woke up, she quickly escaped by jumping out of the window, but not without punching Wataru in the face first. This girl, Rinna Sawaki, ends up being a transfer student of Wataru's school, as well as the new roommate of Wataru's dormitory. Wataru lives with four other girls and their school teacher, but due to Temizugawa Heavy Industry's cancellation of their aviation branch—South Sakojima Island's major company—the families involved with the corporation have to be evacuated in one year. As a result of this, the four girls have to leave the island in one year's time. Knowing this, Rinna refuses to become friends with Wataru and the other girls, because of the pain that she might experience as a result of their eventual separation; however, Wataru disagrees with her, and over the course of the year, tries to convince her otherwise. (Source: ANN)

Tanaka Tetsuro is excited at getting a full scholarship at a new high school, far away from his family. What he does not know is that he will be the only boy in an all girl school, and that there is a girl head-over-heels in love with him, waiting for his arrival. But his special friendship with the very cute and dynamic Asuka also causes him to get into a lot of trouble with the powerful student council leadership, as they are at open war with Asuka and her five friends, a group of super amazon warriors called the Koi Koi Seven.

Seiso Academy is a prestigious high school that sorts students into two majors: General Studies, characterized by distinct grey uniforms, and Music Studies, characterized by pristine white uniforms. While rushing to class one morning, General Studies student Kahoko Hino has a chance encounter with Lili, a small fairy searching for someone with the ability to see her. Lili flies away, and Kahoko, puzzled by their meeting, continues on her way.

Later that day, the participants of a school-wide music competition are announced, and all of them are, unsurprisingly, Music Studies students—at least until Kahoko's name is read out. Immediately tracking down Lili, the small fairy gifts Kahoko a magical violin and convinces her to participate in the competition.

Kiniro no Corda: Primo Passo follows Kahoko's endeavors alongside Lili, as the young student must now face the challenges of competition and go head-to-head against her competitors while navigating a new world of classical music.

[Written by MAL Rewrite]