Bouida Haruto, a hardcore otaku with no interest in 3D (real) women, once appreciated figures from afar, accepting that "if you get into them, there's no turning back." However, when Nona, a character he loved from an anime called "Girls→Planetary Investigation" had a figure of her released, he ended up purchasing it. And then that night, the figure of Nona somehow came to life, and a couple-like lifestyle between man and toy began. (Source: MU)

Yukiya, who is "probably" 14 years old, spends his time DJ-ing alone. Due to his father's influence, he's listened to house music since he was young, and he uploads videos online. He wants to convey something to someone. He wants to be recognized, and become important. But getting hurt is scary. One day, while trying to get more views, he does something that can't be undone. And he sees a live broadcast from "that world." Yukiya believes he can't do anything alone, but that he could accomplish something if he were doing it together with someone else. (Source: ANN)

Episode 0 of Dies Irae.

To succeed to his father, Lid Kail sets out a journey to defeat the incarnation of the evil that seems to dominate the world. Longn and Mimau also began to journey to achieve his father’s will. On their way, Key and Bagda join them. They overcome some difficulties, and finally they met Vaii, the evil. They managed to beat Vaii, but it still doesn't solve their problem...