Deep beneath the purple waters of a cursed lake in Gensokyo’s most treacherous mountains lies Mugenkan, a surreal mansion where reality bends and nightmares take shape. Ruled by the enigmatic Yuuka Kazami and guarded by formidable youkai, demons, and spirits, this domain, known as the World of Fantasies, draws only the desperate, the foolish, or the doomed.

Those who seek Mugenkan must brave:

- The territorial Orange, a youkai prowling around the mountains near the Lake of Blood.

- Kurumi, the prideful vampire who watches over the Lake of Blood.

- Elly, the gatekeeper whose scythe is itching to be used again.

- The twin demons Mugetsu and Gengetsu, creators of this unstable realm—one playful, the other cruel.

- And Yuuka herself, whose playful demeanor hides terrifying power.

Will the traveler come for forbidden knowledge? A doomed bargain? Or has Mugenkan already claimed them in ways they don’t yet understand?