Lots more done today. Explored another Makai section in the 3rd stratum, the Misty Lake, some kind of lovely area, and the Sanzu River.
Ended up adding multiple new shikigami to my arsenal. Cirno was the first to be collected, then I bumped into Koakuma at the new Makai area and added her, but not before I had to beat her in battle.
How I didn't game over to Koakuma when I wasn't prepared at all for her, I don't know. Only Yuyuko survived that battle thanks to spamming her one spear move which had a high priority for going off first.
Moving onwards into more areas, found a Medicine, then found a cave with a boss. Once again I wasn't exactly setup to handle the fight more smoothly, but I still won on my first try. Thank god my Yuyuko's Jinzo knew Dispel. Boss loved to buff itself up real good. Got a Suwako out of that one (Seems to have some pretty decent stats right now).
Sanzu River saw me getting four shikigami: A Ninja, Osendaku or whatever its name is, Shizuha (Had to beat her in battle, not quite as determined to kick my ass like Koakuma), and Nue. That last one is pretty good with an attack for Fire/Ice/Earth/Lightning to abuse Youmu's chasers even more.
Levels are getting pretty good now for my main team, around 28-30.