Blue Proustian Moment is a really excellent yuri manga on manga plus (for free to read!) that is not getting nearly enough attention. Complicated and compelling protagonist together with pointed commentary on gentrification and classism. Read it today!

Day 2: Kind of a hard category, but I'll go with Yu-Gi-Oh! Objectively a mediocre anime at best, I have a lot of fond memories of when I was hugely into it as a teenager. And there are enough completely ridiculous elements (magic deck stacking, everything about Kaiba) that it holds up on a rewatch.