Lost Song?

I made a reddit account just for this, but I'm losing my mind.

About 7-8 years ago, there was this four-part Japanese song series on YouTube that I believe got deleted at some point. I remember the plot, but whenever I look it up, I can't remember the name.

Basically, there's this robot with white hair. Her creator sends her back in time to historical Japan to witness the m*rder of a young girl and her lover's eventual s**cide of her lover under a cherry blossom tree. Then it goes back to the present to reveal the robot is the reincarnation of the m*rdered girl, and her creator is the reincarnation of her lover. The robot doesn't really understand feelings and stuff, and I think that's a major theme of the series? Again, it's been years, so the details are fuzzy to me, but I genuinely can't find it anywhere and I'm starting to wonder if it ever really existed. If anyone has any clue what I'm talking about, I'd love to get some help with this.