Kivotos is a federal megalopolis comprising thousands of schools and is led by the General Student Council (GSC), which acts as its governing body. Ironically, despite being an academy city, Kivotos is rife with gun violence, and all students wield firearms as part of their everyday lives. As if the crisis in Kivotos was not enough, the GSC president is nowhere to be found. Fortunately, before her sudden disappearance, the GSC president enlisted the help of Sensei—a teacher who is most likely the only one in Kivotos—to support students in their time of need. Sensei's first course of action is to assist Abydos High School, a once prestigious academy now with merely five students in attendance. These remaining students are doing everything they can to pay their academy's crippling debt of almost one billion yen.

Mahiru Kouzuki, a skilled artist, gives up on her passion after her elementary school classmates ridicule her colorful jellyfish mural. Several years later, upon encountering an unexpected admirer in Kano Yamanouchi—a former idol with a troubled past—Mahiru decides to pursue her childhood dreams once more. Tasked with designing the mascot for Kano's new music project, JELEE, Mahiru enlists the help of her childhood friend and professional streamer Kiui Watase to make JELEE's first music video. Together with Kim Anouk Mei Takanashi, a pianist and fan of Kano's work as an idol, the girls aim to turn JELEE into a global hit. However, if they want to succeed in this ambitious endeavor, they will first have to free themselves from the shackles of their pasts.

Although everything the young duke touches perishes, his existence is far from lonely. His spirited siblings Viola and Walter, loyal butler Rob, and the eccentric witches Cuff and Zain are regularly livening up his secluded mansion. But it is the duke's flirty maid, Alice Lendrott, who fills him with the promise of a beautiful tomorrow and the determination to break this hellish spell cast upon him. The identity of the witch who cursed the duke has been uncovered thanks to Zain's unique magic and the help of Daleth, the leader of the underworld. However, the villain is a notoriously fearsome and powerful witch, who, enraged by the duke and his companions' trip back in time, torments them even from the afterlife. Moreover, an unexpected loved one reappears, strengthening the duke and Alice's hope to break the curse and finally close the distance between them.

At the request of Queen Victoria, Earl Ciel Phantomhive goes to Weston College—a prestigious public academy for boys, known for its traditions and outstanding curriculum—to search for a relative of hers who has not returned home in months. Thanks to his noble status, the 13-year-old Ciel is swiftly able to enroll as a student, while his devilish butler Sebastian Michaelis assumes a teaching position at the school. Ciel does not anticipate being unable to locate the Queen's relative on campus. To make matters worse, he cannot request a meeting with the headmaster of the college, who may be the only person that knows anything pertaining to the disappearance. The only ones in frequent contact with the headmaster are the heads of the college dormitories, known as the Prefect 4 (P4): Edgar Redmond, Lawrence Bluewer, Herman Greenhill, and Gregory Violet. Ciel must concoct a plan to get in the P4's good graces if he wants to use their connections to succeed in his mission. But the distinguished college and its students hide much that is unseen, making this task more improbable than he could imagine.