Set in a futuristic world, the series follows a boy named 21 Emon, heir to a long dynasty of hotel owners, whose ancestor goes back to the Edo Period.

[5] Shogakukan released the series in four volumes, under their Tentōmushi Comics imprint, from August 25, 1977,[6] to April 25, 1978.

[7] A five-volume edition was released by Chuokoron-Shinsha, under the Fujiko Fujio Land [ja] imprint, from June to October 1984.

[10] A two-volume edition was released by Shogakukan as part of their "Fujiko F. Fujio Complete Works" collection on August 25 and December 24, 2010.

[11][12] Shogakukan published another four-volume edition under the Tentōmushi Comics imprint from July 27 to October 25, 2018.