東方封魔録 ("Touhou Fuumaroku") ~ The Story of Eastern Wonderland
("Recorded Sealing of an Oriental Demon")
Second game of the Touhou series.
Hakurei Reimu has returned from "training" in the mountains when she found her Hakurei Shrine overran by ghosts and youkai. She goes down to investigate the source of the invasion, leading her to an evil spirit and her apprentice.
The game also marks the debut of Touhou's (then-future) secondary protagonist Marisa Kirisame, appearing here as the boss of Stage 4.
This tag implicates touhou_(pc-98) and touhou (learn more).