S1.E13 ∙ OVA: Astarotte no Omocha! EX

In the midst of a field exercise operating I-Machines, Alliance Academy student Maya Mikuri is thrown into an entirely different kind of adventure.

A team of middle school girls fight inter-dimensional beings using the powers of friendship and technology.

Steam City is a place where the only fuel source is coal, and the only means to produce energy is the steam engine. As the only source of energy, the steam engine has been the focus of technological advancement to the point where it can be substituted for any other form of power in modern technology. These same advancements also have given rise to Megamatons, large steam-powered robots. With the air of Steam City thick with fog and white smoke, thieves and criminals flourish with Megamatons as a common tool in their nefarious plans. It is here that the reader and/or viewer finds Narutaki, a young detective fighting for the peace of the city.

Estelle and her brother are in the wrong place when chaos breaks, and they embark on a rescue mission to find their father.

Kiri Haimura has an obsession with beautiful hair--specifically, cutting it. This bizarre trait is what leads him to seek out a rumored long-haired ghost who lives in an abandoned house on a hill. However, he finds not a ghost, but a beautiful girl with long flowing hair named Iwai Mushanokouji, the "Hair Queen," whose hair cannot be cut due to a family curse. Iwai explains that there is a death game surrounding her, and that if she is killed by a cursed object, aptly named a "Killing Good," the wielder gets their wish granted. After protecting Iwai from "Authors"--Killing Goods users--he learns there is in fact a Killing Good passed down in his own family: a pair of scissors used by his ancestor to commit murders. Naming the scissors "The Severing Crime Edge," he finds that he is able to cut Iwai's cursed hair with them, setting her free to live a normal life. However, many Authors seek to kill the Hair Queen, and Kiri will have to protect her in this lethal game of fate.

In a world where information is heavily censored, Kasahara Iku joins the Library Force to protect the freedom of literature and follow in the footsteps of a man who once saved her favorite book from being destroyed.