This series has now been updated to include the final four volumes.
Fun fact: The mangaka for this series is Oku Hiroya. After completing it, he’d soon after begin writing his most famous work: Gantz.
Hen (8 volumes, complete)
I don’t know why, but even with a vast amount of explicit hentai / doujin out there, I still feel shocked seeing pubes in non-hentai ecchi. Simple pleasures, I guess.
This manga spawned a 2 episode OVA in the late 90s. Which, VHS quality aside, are pretty damn awesome.
After doing a bit of research, I discovered that this manga is actually a follow up to an 13 volume manga of the same name and author published in 80s and early 90s.