you should watch casshern sins and reflect quietly on the nature your soul
Casshern Sins redefines existential nihilism. It's great, but took me multiple tries to get through.
The English dub is good, too (watched both versions.)
I watched this after I made a big fuckup in my personal life, so it hit me right in the feels
spoiler (click to show/hide)
;A;
But you never lost your way,
And made your way back home~
So we hold each others hands,
As we walk along the way~
No more fears and tears to fall,
We'll find a way back home

There's literally no clip of it online but the English dub sung by Caitlin Glass is just as good, and has less engrishy lyrics, and it just as powerful.