Nicaea czyli tajemnicza aplikacja, która zyskała sobie wielką popularność za sprawą dostarczania jej użytkownikom materiałów wideo ze śmierciami ich przyjaciół. Taką właśnie wiadomość otrzymali główni bohaterowie, Hibiki Kuze i Daichi Shijima oraz Io Nitta. Mieli oni zginąć w wypadku metra. Gdy już nastało nieuniknione, Nicaea dała im drugą szansę. Zadała proste pytanie: czy chcą dalej żyć, czy może umrzeć? Odpowiedź była dla każdego wiadoma i tak po wybraniu dalszego życia zostali oni wciągnięci w coś, co przerosło ich najśmielsze oczekiwania.

Liu Yinuo, a 30-year-old ordinary office worker, was accidentally summoned to the game world. To get back to the real world, Liu Yinuo, an excellent game player, began to teach an 18-year-old girl, Tian Enya to play games, who is the savior in the game world. In the end, the two girls finished the goal in the game world with the help of many partners and returned to the real world with a more positive attitude towards life.

Due to family circumstances, Setsuna Kai is moving to a new city where he's supposed to live by himself in an apartment. As soon as Setsuna arrives, he witnesses a mysterious rain of rocks and barely escapes being crushed by an enormous boulder. Setsuna's new home wasn't as lucky, being completely destroyed by another giant boulder. Setsuna is distraught, not knowing what to do when he's approached by a scientist named Hiromi Kaname. Dr. Kaname's equipment apparently can tell that Setsuna is a "Devil Child", and so Dr. Kaname decides to take Setsuna to his laboratory.