Quick explanation: the original song is from one of the video games in the video game series Touhou. The creator of the video game series allows fans to create

Quick explanation: the original song is from one of the video games in the video game series Touhou. The creator of the video game series allows fans to create derivative works. As a result, there are lots of interesting works that its passionate fanbase has created, and many of those works build on others' works. As more examples, here are more recent videos also inspired by the Touhou series: https://m.youtube.com/watch?v=xRSlq42_sUE&vl=en https://m.youtube.com/watch?v=xRSlq42_sUE&vl=en https://m.youtube.com/watch?v=KjJMWj6BYhY https://m.youtube.com/watch?v=KjJMWj6BYhY