Halluci-Sabbat of Koishi is a fast-paced 2D side-scrolling action game set in the Touhou Project universe, and it immediately makes one thing clear: this is a tough game. It follows Komeiji Koishi, a Satori yokai adventurer, as she helps a human witch search for valuable potion materials while facing off against illusionary mushroom folk, undead enemies, and other strange creatures in a twisted, mysterious Gensokyo.