The production was listed as of July 2, 2023 AniDB.
Koumijima Shuu seems to refer to a Japanese individual, possibly an AV performer or an adult entertainment personality. The phrase "7 de Umeru Mesutachi" could be translated to something related to "seven" and "mesutachi," which is a colloquial or slang term in Japan. Koumijima Shuu 7 de Umeru Mesutachi