Published by Fujimi Comics in 1996.

There was a gallery with the two volumes mixed together, but it had been taken down since. I sorted all the pages, renamed them with the real page number, and here it comes. This volume should include an extra chapter not related to the main story, unfortunately it is missing.

English version was released as "Co-Ed Sexxtasy", it was split in many comic book releases, this is the first one: https://e-hentai.org/g/21484/48870085c6/
Chinese version, you can see the extra chapter at 142-161 (and Protonsaurus stuff after, wtf) : https://e-hentai.org/g/204252/8e1cb048c2/