So I was making fake scenarios at night and just as I was about to fall asleep, I suddenly had a very vague flashback of an anime

I spent the whole day trying to remember what it was, I used up all my brain cells and those vague memories. But still nothing 🥀 just as I was about to conclude that I'm prolly schizo and made up those memories I SUDDENLY FOUND IT ∑(๑ºº๑)!!

So my question is
Has anyone watched this anime, because I've never heard anyone talk about it