I’m watching Frieren right now and it’s quite good when it’s at its best.
That said, while the intro is catchy it has like 3 acts and is this really fast up-beat song, almost hyper-pop? When paired with the outro (a grand ballad that very frequently begets a jarring shift in tone at the episode’s end, and beginning) it feels like the actual show only makes up like two thirds of the runtime.
Gotta be Bye Bye Yesterday from Assassination Classroom
I found a YouTube link in your comment. Here are links to the same video on alternative frontends that protect your privacy: