You don't have to shine to have youth. First-year high school student Uta Komaki loves to sing, but she's extremely shy, timid, and a bit of a coward. She wants to join the light music club for her high school debut, but she's too intimidated by the dazzling presence of the members to submit her application. In her moment of despair, she receives an invitation to join the a cappella club from the president, Airi Kojou... The a cappella club is filled with unique individuals—some might say they're a bit odd. Even if they're not flashy or popular, there's a special kind of youth that connects through their voices, creating something truly unique.

Seiran Island is a tropical eden where wanton sex acts are encouraged under local "pervert law." But even in this paradise, some prefer to remain celibate. There's the lesbian younger sister who would secretly bone her brother... The classmate everyone has labeled as a wild slut... The tiny upperclasswoman, so petite that guys think she's off limits... The shy girl who's a bit self-conscious about baring some skin... And here I am, a guy with a "huge" complex about his "little guy." Despite this, we form the anti-copulation front: No Love, No Sex! As its founder and head honcho, I, Junnosuke Tachibana, will not stop until we have abolished this ridiculous sex law for good! I've even stumbled upon a generous soul in this mysterious, wealthy gentleman whose name remains a mystery... He's already set us up with a secret hideout and a tonne of money. In exchange, he asks us to find someone and "protect her at all costs." So, she has the key to our mission's success...? In this case, there's only one thing to do: find the mystery girl. And all while keeping the SHO off our trail,... Oh, and we also have to keep our virginity intact. Make no mistake! Just wait and see! I'll repeal that perverse law!

At the age of 15, Hana Tabata has already made peace with the idea of never experiencing an unforgettable high school romance. Although she likes shoujo manga, flowers, and anything cute, Tabata considers herself a mere background character; she is a little bit chubby, with a round face, glasses, and freckles—all things that would make her conventionally unattractive. But when Tabata accidentally befriends Yousuke Ueno, a warm and charming classmate, things start to change. While she grapples with conflicting feelings about her unexpected new relationship with Ueno, Tabata has yet to realize that the love story she has been dreaming of has already begun.

Seven years after humanity was devastated by a major disaster, a beacon of science and prosperity rises in Kamitsubaki City. But lurking in its shadows are Tesseractor, monsters born from human darkness. Only the Witchling, five girls with voices that wield magic, stand against them. With every note, they fight, not just to protect the peace of the city, but to heal a broken world.