[b] is a Japanese web novel written by Kimula and released on Pixiv from August 2018 to November 2020.

A manga adaptation, illustrated by Jiro, was serialized on Shogakukan's MangaONE app and Ura Sunday online platform from July 2019 to September 2020.

web novel, written by Kimula, was posted on Pixiv, with 18 chapters released from August 5, 2018 to November 21, 2020.

[3][4] Kadokawa published it in two print volumes, with art by Jiroalba, released from June 15 to October 15, 2020.

[5][6] A manga adaptation, with art by Jiroalba, was serialized on Shogakukan's MangaONE app and Ura Sunday online platform from July 9, 2019 to September 1, 2020.