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Artist's commentary
Mononobe no Futo
I have no idea what her name is yet. D:
But I think it's Kaku Seiga? I'm not sure...Maybe Sagaro Toriko? Mononobe no Futo? Toyosatomimi no Miko?
I just found out her name is Mononobe no Futo.
Oh wait, so apparently there are 2 bosses for stage 5, according to ~Mad-Silence
Mononobe no Futo is from Touhou