FlandresOldWorld | MB Kasumi's Theme: Submarine Illusion @FlandresOldWorld | Uploaded 11 years ago | Updated 17 hours ago
This is Kasumi Shindou's theme from the fanmade Touhou game published by Primary-Color Space, Touhou Kaikeidou ~ Marine Benefit

Artist: Crystal wingS
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Not really that exciting for a Stage 4 boss... it sounds like the themes building up to something, but then nothing happens. How boring.
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Artists: (tags: mkz / tottema)
http://danbooru.donmai.us/posts/575484?tags=shindou_kasumi