Anime adaption of the game 428. Type-Moon's Nasu Kinoko and Takeuchi Takashi are in charge of the anime script and character designs. They also made the script and character designs for one of the bonus scenarios in the game.

The visual novel tells a present-day story about a detective, a young man, a virus researcher, a freelance writer, and a cat mascot character who are brought together by bizarre events with worldwide implications in the Tokyo neighborhood of Shibuya. Type-Moon is already producing a bonus anime scenario for the game. Screenplay writer Kinoko Nasu and original character designer Takashi Takeuchi of Fate/stay night and Tsukihime, Lunar Legend fame are involved in both 428 projects.