"Oh, I found the mysterious shining thing! Is this really an alien encounter?""What's an alien?"— Sanae Kochiya and Nue Houjuu (Undefined Fantastic Object Extra Stage.)

Nue Houjuu (封獣 ぬえ Houjuu Nue) is said to be one of the most mysterious and feared youkai in many years and has been defeated by humans many times. There are differing legends according to her appearance due to her concealed true form. At some point, she was sealed underground, but the events of Subterranean Animism caused her to resurface in Gensokyo during Undefined Fantastic Object.