It sounds like you're referring to a specific Japanese adult video (AV) title or a niche genre work — possibly a parody or a themed release. The title "Koumijima Shuu 7 de Umeru Mesutachi" seems to blend elements of survival or island settings ("Koumijima" might be a fictional island name, possibly a play on "Koumi Island" or "Koumi-jima") with a numerical or volume reference ("Shuu 7" could mean "Chapter/Collection 7" or "Issue 7"), and "Mesutachi" meaning "females" or "women."
The story follows Seichi Ozaki, an overprotective teacher with a passion for remote travel. His latest trip leads him to Ushiha Island—locally known as "Koumijima" or the Island of Childbearing. The island hides a centuries-old biological anomaly: for reasons unknown, the local women carry pregnancies to term in just Koumijima Shuu 7 de Umeru Mesutachi
沖縄本島からフェリーで北へ約2時間——小さな珊瑚の島、古見島（こうみじま）は、静かな海と濃密な自然、そして時間がゆっくり流れる村の営みで知られる。ここで過ごす一週間は、日常のノイズを削ぎ落とし、海と風と人々の声だけが残る豊かな体験になる。今回は「7日間で古見島に埋まる（＝古見島の暮らしや風景にどっぷり浸る）」ことをテーマに、日程ごとの過ごし方と心に残る瞬間を綴る。 It sounds like you're referring to a specific
"Koumijima Shuu 7 de Umeru Mesutachi" appears to be a Japanese title, and without direct translation, it's difficult to provide a detailed response. However, I can offer some general information. The island hides a centuries-old biological anomaly: for
The series is often discussed for its visual fidelity and how it translates the original manga's character designs into animation. Within the adult media community, it is noted for its focus on specific tropes related to isolated societies and fertility myths.
While the title explicitly promises themes of impregnation and breeding, the series handles these themes through a lens of mysticism rather than pure debauchery.