This is Tsurubami Senri's theme from the first game of Len'en series, Evanescent Existence.
She's really cool extra boss, but I have only beaten her on ''easy''.
This is my favorite theme from Len'en games so far, although it sounds very creepy. Second must be Adagumo no Saragimaru's theme from Earthen Miraculous Sword.
Next I'm going to upload Clause's theme, I think...
Enjoy!

(Sorry about this part: 6:38. I didn't notice until I uploaded this. )

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