DESCRIPTION:
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NUNS2 has a crazy easter egg: It's made of AMVs!

For this song I took the finale cutscene of the Sakura vs. Sasori fight and rewatched the episode to see which song was played at this point. When I put the two together I found they're not only the same length, the video was obviously animated to fit this music.

This is true for all the boss fights as well as the FMV story segments.