Touhou Suimusou: Immaterial and Missing Power

After the Spring Snow Incident fades from memory, a strange routine takes hold at the Hakurei Shrine — feasts repeating every three days, always accompanied by an unusual mist. The player character investigates the source, eventually tracing both back to the oni Suika Ibuki, who has dispersed herself into the fog to gather the hearts of Gensokyo's inhabitants for perpetual celebration. Unable to exorcise an oni outright, the girls find that Suika eventually drifts away on her own.