The story takes place in Huanli (the Year of Dazzling) 3015. Donatia and Kouran, two countries fighting for supremacy, are causing the world to be torn apart due to the constant war. Amidst the strife is the island country Nil Kamui, which has lost its independence. Red Dragon, the guardian god of Nil Kamui, goes out of control. Will the island country be able to regain its independence?

In the world of Hidan no Aria AA, there are special students called Butei who are authorized to carry weapons, investigate crimes and solve various incidents. One of the best of these students is an S-rank second year at Tokyo Butei High School named Aria Kanzaki. On the opposite end of the scale is E-rank first year named Akari Mamiya.

Futaba Odagiri is incredibly energetic but is also a glutton. Teru Hayama looks like an angel but she is really a demonic class president. Yoko Nishikawa is the daughter of family that used to be a member of the upper class, but after her father's company went bankrupt, they became poor. All three high school girls have the kanji for "leaf" in their name but could not be any different from one another.

First-year high school student Tamaki Honda and her SNS club as they work together to create a self-published game. With Tamaki as the project’s illustrator, she works alongside the club’s other (rather peculiar) members, including Shiina (the club president and game programmer), Ayame (the scenario writer), Kayo (their music composer), and Yumine (the club’s boys’ love expert).

20-year-old Michiru Amatsuki moved to Tokyo due to a change of career. She decided to live in a woman-only share house Stella House Haruno with people of different age and occupations. It's always fun when there's delicious alcohol and meal!!

The stage is set during the 19th century London, in its capital where a wall divides the east and west of the Kingdom of Albion. Five high school girls, who enrolled in the prestigious Queens May Fair School, are involved in spy activities that involve disguise, infiltration, car chase, and more. These girls take advantage of their special abilities and fly around the shadow world.

Shōtarō Tatewaki is a normal high school student with a serious demeanor hangs around with Sakurako Kujō. Sakurako is an extraordinarily beautiful woman in her mid-20s from a rich family who loves "beautiful bones." The two live in the city of Asahikawa in Hokkaido, and they get involved in various incidents regarding bones.

This is the story of Tooru Kokonoe who has enrolled at Kouryou Academy, a school which trains students in wielding Blaze, soul powered weapons to prepare them for the Dorn Agency's special peacekeeping corps. When Tooru is partnered with a mysterious girl: Julie Sigtuna, he finds he has to overcome many hurdles to ensure their teamwork and fighting skills are up to par for the duration of their training.

Hakuno Kishinami finds himself in the midst of a Holy Grail war with no memories of how he got there. Through his confusion, he must fight to survive.

Ever since their champion was defeated, the world of girls' junior high ping pong has been in turmoil. Koyori is the new smirking transfer student at her junior high and she's ready to shake up girls' ping pong.

"Hundred"—that is the only weapon that can oppose the mysterious life form "Savage" from visiting the earth. The protagonist, Kisaragi Hayato, aims to become a Martial Arts Master using this Hundred. He managed to get into the battleship university Little Garden. However— "I wanted to see you, Hayato!!!" "H-How do you know my name?" Around the roommate, Emil Crossford, who somehow knows him well (?), Hayato gets an uneasy feeling. What's more, just after the entrance ceremony, he gets asked for a duel by the campus' strongest martial arts master "Queen" Claire Harvey...!? The ultimate academy battle begins here!