AoCF Youkai Tanuki Forest Theme: In the Deep-Green Tanuki Forest 

This theme appears a grand total of once in the entire game, and in the final bosses' scenario. It's like they went "oh wait, we need this track somewhere".
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The soundtrack comes from the 15.5th Touhou Project game, an aerial fighter spinoff called 東方憑依華　～ Antinomy of Common Flowers. You can buy the game here on Steam:
store.steampowered.com/app/716...
Song: In the Deep-Green Tanuki Forest (深緑の狸森にて)
Composer: U2 Akiyama
Image source: www.pixiv.net/member_illust.p... (tenth image)

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