I'm gonna be honest, I'd only ever heard the "nǐ hǎo nyan" jingle in that one brony fan-animation of Derpy Hooves doing the dance, where there's a random weird bit in the middle implying that Derpy is inviting Doctor Whooves to make a little pony sex tape. And then in the years after I watched that brony fan-animation, the jingle would keep randomly popping back into my head, without me remembering where I first heard it, and for some reason never thinking to look into either where I first heard the jingle, or where it originally came from... And now, serendipitously, I stumbled upon the original source.
And with that I have gotten closure about yet another random weeb thing from my childhood that I didn't even realize I wanted closure about.
Yes, but it's also an idol anime.
Alright, I'm sold.