第3章 (Chapter 3 Boss?) Extended to 20 minutes+
This BGM first played on Chapter 3, but i dont remember where, maybe the boss., also this theme mostly used at time trial stage.
There is official name for this on the original soundtrack CD, but my Hdd died, so i dont know anymore. sad.
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Other Shironeko Project extended BGM:
https://www.youtube.com/playlist?list=PLJSFfiBIf4LDlQUpy154dNJiRqeVQaZA3