I'm fairly sure that demons, succubi & balrons won't drop them...
If you want a SE item (kasas are an SE item) then you need to kill monsters that came out with that expansion. Such as Hiryus both lesser and greater, fan dancers and probably the hardest but most rewarding Oni. There are also Yamandon but I seem to remember they have high resists and so are likely hard to kill. Bake Kitsunes and Lady Of The Snow (I think) drop the equivalent of level 3 loot where as the first three I mentioned (Hiryu, Fan dancers, Oni) are level 4 or 5.