Chacha is a cheerful girl who spends most of her days practicing magic under her teacher Seravi, hoping to become as skilled as he is. Though Chacha is enthusiastic, her tendency to make unfortunate puns out of her magic chants leaves her teacher wondering if she is ready for magic school. Deciding that there is no better time, Seravi gifts Chacha the Princess Medallion, allowing her to transform into a magical princess capable of defeating even the fiercest opponents. Together with her best friends Riiya, a werewolf boy, and Shiine, an apprentice of Seravi's old rival, Dorothy, Chacha sets out to defend the world from sinister forces. However, between the Great Evil Lord plotting against them, Riiya and Shiine's rivalry to win Chacha's affection, as well as Seravi and Dorothy's complicated relationship, Chacha struggles to find balance between fighting evil forces and mending relationships in her everyday life. Though obstacles continue to come her way, Chacha is determined to overcome any problem she faces with love, courage, and hope by her side.

Ever since she was young, Komichi Akebi has always adored sailor uniforms, even going so far as to ask her mother to sew one if she succeeds in getting into her mother's alma mater, Roubai Academy. And thus, when she gets accepted into the prestigious school, Komichi is ecstatic. However, much to her surprise, the middle school no longer uses sailor uniforms as its dress code—making Komichi stand out from her schoolmates. Despite this, Komichi is granted permission to continue wearing the traditional attire. With renewed confidence, Komichi meets fascinating classmates as they experience school life together. Under the colorful shower of blossoming prospects, an exciting tomorrow awaits them!

Returning from their summer vacation, the students of Class 3-E at the prestigious Kunugigaoka Middle School find themselves up against unbeatable odds. Faced with the possibility of world annihilation, the students must come up with increasingly elaborate and creative ways to kill their teacher, the cunning yet optimistic and helpful Koro-sensei. However, eliminating Koro-sensei is not the only objective the students need to worry about. Gakuhou Asano, the academy's merciless and cruel principal, seeks to prevent Class 3-E's success by brainwashing his other hard-working pupils into ruthlessly competitive studying machines. Hostility begins to linger in the air as traitors and killers alike attempt to claim the bounty on Koro-sensei's head for themselves. Nagisa Shiota, one of Class 3-E's most skilled assassins, finds himself in the middle of the conflict. While he works to maintain his academic standing and prevent the end of the world, domestic affairs jeopardize his place in Class 3-E. Together with his dedicated classmates, he must now face the threats head-on.

While most young girls make an effort to show off their feminine charms, Futaba Yoshioka deliberately behaves like she wants to repel anyone who might be attracted to her. Ostracized by her female classmates in middle school for being a little too popular with the boys, she desperately strives to avoid a similar situation in high school by being unnecessarily noisy and graceless. Nevertheless, scattered among Futaba's unpleasant memories are the treasured moments with the boy she had a crush on, Kou Tanaka. Unfortunately, that spell abruptly ended on a sour note when he suddenly stopped attending school and never came back. When Futaba finds out that Kou has returned—with a different last name this time—she can already feel the butterflies in her stomach. However, Kou Mabuchi is not the warm boy that she remembers from her days in middle school; he is now taller, more charismatic and withdrawn—making him far less approachable. Futaba believes that if she returns to her former self, Kou will begin to take notice of her again. But is she prepared to sacrifice her bubble of normalcy and risk losing her friends in the process?