In a world where ironworking has been transformed by the 'cultivated iron revolution' — a technology that grows iron products from the plant Kuroganesou — science journalist Koike travels to Kanazawa in the early 1990s to interview Yagi Koichiro, a man who spent ten years alone cultivating a Ferris wheel at an abandoned amusement park. Asked why he grew a Ferris wheel no one could ride, Yagi begins to recount an unexpected family history tied to the research of Kuroganesou cultivation.

In the early 1990s, when iron-cultivating plants had become widespread, one man was quietly raising a Ferris wheel alone in an abandoned amusement park.

In a near future where everyone carries a digital brain implant called a denka-nou, Kiriyama, a cleanup hitter on a high school baseball team, is plagued by the yips that freeze his arms at bat. One day, his female team manager Nakamura secretly installs an unauthorized app that can swap the consciousness of two people who lock eyes. Nakamura, who once showed exceptional athletic talent but was sidelined to manager duties by rules barring girls from competition, offers to step in for Kiriyama at bat. A refreshing coming-of-age SF that explores mutual understanding and the question of who gets to stand at the plate through the lens of mind swapping.

In an age where everyone carries a device called a digital brain, an unauthorized app makes the swapping of consciousness between two people possible.