In a world of adventurers and magic lies Naral Island. Every generation, a Demon Lord rises to plague the land, and every generation, a Hero is born to subdue him. For countless centuries, the cycle has repeated with no end in sight. The latest Hero, Juulia "Yusha" Charldetto, has almost completed her valiant campaign alongside her party members: responsible priest Seiran "Seira" Élénoir, enigmatic mage Meiza "Mei" Endust, and hyper-energetic warrior Fai Fai. In the final battle against the Demon Lord, Yusha's party attempt a risky spell to cast their enemy into the drifts of time. But the incantation goes awry, sending Yusha and her friends back to a time before the Demon Lord, before Yusha becomes the Hero, and before the party had even graduated as adventurers. With their memories of the future erased, the four girls restart their ambitions to become the Hero's Party, aspiring to defeat the Demon Lord. However, in a sudden twist of fate, the Demon Lord was also sent back in time with her memories intact. Reduced to the form of a little girl, the Demon Lord takes the name Mao and infiltrates the adventurers' school as a teacher, planning to stop Yusha before she becomes a hero. Thus begins the story of Yusha and her friends, in their quest to defeat the Demon Lord, not knowing that the one they seek is right by their side. [Written by MAL Rewrite]

An edited and condensed version of the TV series.

While Luffy and his crew of Zoro and Nami are starving on their small boat, they are attacked by a large monster. Nami is taken away, while Luffy and Zoro wash up on shore. There they meet a young girl, Medaka, and learn of the sad history of the island. The evil Pirate Ganzack has taken away all the men in the village and enslaved them, including Medaka's father. Now Luffy, Zoro, and Medaka must infiltrate Ganzack's base in order to rescue the villagers and Nami. (Source: ANN)

To be around cute girls wearing cute clothing is all Eruna Ichinomiya desires. Since Mikagura High School happens to have the cutest uniforms around, she decides to enroll in this prestigious high school known for its cultural clubs. However, she does not realize that joining a club is mandatory, and representatives from each club must battle for a ranking. Based on these rankings, club members are awarded housing and food. Chasing after Seisa Mikagura, the most beautiful girl in school, Eruna joins the going-home club but finds herself thrust into fighting the next club battle. With the other club representatives wielding unique powers, the competition is sure to be fierce! Based on the popular song series, Mikagura Gakuen Kumikyoku follows Eruna as she explores the various clubs in school and assists the members with their troubled lives, all of whom are also vying for the top spot in school. [Written by MAL Rewrite]