36-year-old bachelorette Mami achieved success with an essay she wrote 10 years ago. Mami has since lost her way, and hasn't been able to write a hit piece. Meanwhile Yukino, who leads an independent life, Ayaka who is a housewife, and Miho, who makes her livelihood as a "daddy's girl", are each facing various difficulties in their own lives.

An anonymous letter is delivered to the Tokyo Metropolitan Police Department. The letter states that a criminal of a murder case will appear at the countdown party Masquerade Night that will be held at Hotel Cortesia Tokyo. Detective Kosuke Nitta must go undercover and work again at the Hotel Cortesia Tokyo. There, he meets Naomi Yamagishi, who works as a concierge. Without any information about the criminal, except that the person will be in attendance, Detective Kosuke Nitta works feverishly to find the criminal among the 500 attendees.

In 1984, an up-and-coming writer named Aida Taiju has her career crushed by off-hand criticism from an established author, Higashijujo-sensei. They end up holed up writing in the same hotel historically favoured by authors in the Jimbocho publishing district. Swearing revenge, Taiju makes Higashijujo miss his writing deadline by pretending to be a different person, and entangles her editor into the ruse. They become entangled in a long-lasting feud of revenge where Taiju uses her acting background and pretends to be various different women in order to have her revenge on Higashijujo or blackmail him. Based on a novel by Asako Yuzuki from 2012.

A spin-off from Assassination Classroom, in this world, Koro-Sensei is the Demon King while the students of class 3-E are cast as heroes who must defeat him. The students learn swordsmanship and sorcery at Kunugigaoka Magic School. Their strange adventure begins!

After his sister, Sara, accidentally kills her threatening teacher in self-defense, Wataru makes a desperate decision to protect her. He uses an AI chatbot to generate a plan for the "perfect crime," staging the crime scene and covering up evidence based on the AI's instructions to make it look like a random homicide.