Awakening her dormant abilities as a devil one day, Yuuko Yoshida aka Shadow Mistress Yuuko, is entrusted with the mission to defeat the Light clan's shrine maiden, a magical girl, by her ancestor Lilith. Yuuko meets magical girl Momo Chiyoda through her classmate Anri Sada, and challenges her to a duel, but loses quickly due to her lack of strength.

Since then, Yuuko has struggled with her role as a devil and her duel with Momo, and borrowed help from her regularly. However, by a strange coincidence, Yuuko also weakens Momo by taking away her power to cooperate in protecting the peace of Tama city.

Five years after a mystifying disaster decimates cities across the globe, Seria Morino receives an invitation to join Alice in Theater, a small stage troupe that takes it upon themselves to brighten the world through their performances.

Itsuki Tachibana is a student of Seiga Academy, a co-ed boarding high school with excellent reputation, located in a suburb outside the city center. On a day of second semester, he was summoned by Rina Izumi, the most esteemed and praised chairperson, to the student council room, without knowing what awaits him.

This is Meiro-machi (Labyrinth Town), the town of fortune-telling. In town, there is a fortune-telling shop called Urara, where girls aspiring to be fortune-tellers come from all over the country. Chiya, who was raised in the mountains, comes to the town with a purpose, but what is it exactly? There, she meets Kon who is always serious, Koume who loves all things western, and the shy Nono. Their fun days of living together as apprentice fortune-tellers are about to begin.

Matoi Sumeragi wishes for nothing more than to lead a normal life away from the spotlight. She is quite satisfied alternating between school and her part-time job at her best friend Yuma Kusanagi's family shrine. But this routine life is permanently disturbed when a Night—an evil extra-dimensional entity—attacks the shrine. Matoi is able to drive it off after unwittingly calling upon the powers of a god, the natural enemies of the Nights.

Matoi and Yuma are soon joined by Claris Tonitolus, an experienced exorcist from the Vatican, and agent Haruka Luciela, who works for the secretive Night defense organization IATO. Despite not knowing the perpetrator behind these attacks nor their motive, Matoi must come to master this newfound power in order to protect both the people around her and the once normal life she holds so dear.

The students of Class 3-E have a mission: kill their teacher before graduation. He has already destroyed the moon, and has promised to destroy the Earth if he can not be killed within a year. But how can this class of misfits kill a tentacled monster, capable of reaching Mach 20 speed, who may be the best teacher any of them have ever had?

A class of junior high "misfit" students who are tasked with assassinating their new teacher, an octopus-like creature nicknamed Koro-sensei, who destroyed the moon and threatens to destroy Earth in a year. The students have to learn to balance their assassination attempts with the lessons from Koro-sensei, who is surprisingly an excellent teacher, while the government offers a ¥10 billion reward for his head. Each episode often focuses on individual students, their growth, and their internal conflicts between wanting to kill their teacher and growing to care for him.