Dude, exact same here! It wasn't in my RU-vid history for some reason and no matter how hard I searched, I simply couldn't find it. Thankfully, it was in the history of an old browser hidden on my iPhone, which is how I finally found it again. I thought the video had been unlisted, privated or deleted or something, but no, it was purely RU-vid's algorithm being a jerk. Well hey, I finally got it again, so I'm glad.
Wow like always your music is truly amazing :D. You have great talent. Keep going! Never give up! Flowering night is one of my favorites from touhou and ever since I heard the first remix you made, it really left me speechless of how awesome it sounded *O*.
I know I've messaged you in at least three different ways... but could you upload this song to a site or simply add it to your bandcamp? I'd really like to acquire this song and I'd more than happy to purchase it.