A Touhou doujin with three stories by three circles, thus the inconvinient name. As the title suggests, they’re all about ball-tails, and all with a Youmu x Yuyuko pairing.

Watch out! Youmu-chan! 2. Watch Out On Your Way Home Too! Youmu-chan!

It's four separate doujins, all containing a variety of colorful content (the first is indeed in full color) containing tentacles, egglaying, pregnancy, and such... This one's for all the slightly more...

Here’s a Touhou doujin that follows the simple yet brilliant concept of a futa-loli going around sticking her disproportionate thing into pretty much everything that moves. A seemingly insatiable Mokou follows...