Akira Minato, who has become the manager of an old coin laundry, is approached by Shintaro Katsuki, a second-year high school student who starts visiting the shop for an unexpected reason.
However, Akira, who was unable to end his past love, hesitates to accept her unwavering feelings.
Meanwhile, Hanabusa Asuka, a classmate who finds out that Shintaro likes a guy, comes between the two...?

Cumulative sales in Japan exceeded 1 million copies by 2023.
A live-action drama adaptation will be released in 2022, with season 2 airing in 2023.