Fun Fact time. WA3 plays the OP every time you load your save file. There are multiple OPs but they only change a short bit of visuals that change depending on which Act of the story you're in. The part that changes is around 0:57 - 1:08, usually to show the main villains of the arc.
best OP
Also if you save your game and quit, it plays a short closing sequence, showing some nice illustrations next to your partys stats as a gentle song plays
Between the changing OP depending on the arc and the ED when quitting, I've heard people compare WA3 to feeling like you're playing a multi arc anime which is pretty interesting of an idea
so yeah
Between the uniquness of how its handled, the animation, and the song which SOMEHOW SOUNDS BETTER DUBBED THAN THE ORIGINAL JAPANESE, I'm in love
also my favorite RPG so im biased i know