This is Tewi Inaba's theme from the fanmade Touhou game published by danmaq, Touhou Mutsuigeki ~ Concealed the Conclusion
Original: Demystify Feast
(Hakurei Shrine (Feast Day) theme, from 東方萃夢想 ～ Immaterial and Missing Power)
Tewi: Well now, good evening Kirisame-san. What brings you here?
Marisa: Tewi, why are you running? Where's Reimu?
Tewi: Ah, Kirisame-san, I'm afraid Reimu is long gone. Off to the spirit world, in fact.
Marisa: W-what do you mean? Why would she go there?
Tewi: Because she's dead. And so are you, in fact. We all are. So it would be best if you were to head off and find her before she goes.
