The Gentlemen's Alliance † (紳士同盟†, Shinshi Dōmei Kurosu?), known in Japan as Shinshi Doumei Cross, is a shōjo manga by Arina Tanemura, and was published in Ribon. The name was taken from a Japanese song of the same title.
The atmosphere of the series is very different from Tanemura's previous manga series, as it is a school comedy rather than a fantasy series. Tanemura has said that it is that kind of manga that she has most wanted to write. There are 47 chapters total, and 10 volumes currently out in Japan. The series will be completed with 11 volumes total.