Tatsumaki tells the story of a novelist who is so much in a writing slump that he is actually thinking about selling his life and soul. He meets a mysterious man and discusses creative writing with him; how things such as reality and existing established conventions stop him from writing. A strange chain of events will draw in together a test knitter working under a harsh environment, a frivolous man on an online dating app, and a woman carrying a corpse.

(Source: Anime News Network, edited)