The Aru Koga doujinshi art of 19 years ago looks much better then the Aru Koga professional manga work of these days, imho.
I've decided to scan this one in 600dpi. As the files got way too large for posting, I used FastStone Photo Resizer to reduce in the size in 50%
Doujinshi database lists the title as MUN MUN MUOON, but the last word is really MOON, as can be seen in the cover and, more easily, in page 3 or page 34.