I don't do many arranges of the non-main-line games, but I heard about a single second of some non-touhou song and thought it sounded like the melody from Immortal Red Soul. That was enough for me to make this in one day.
Album: Gensokyo 2300
Circle: Antares Enigma
Antares Enigma:
TheGoldenProof:
Please contact me if you would like to use this in a project. We can discuss the details.
* Remix of a third-party piece.
Excercise caution when using it, refer to author comments / contact the author for details.