The Code Geass Opening 1, Colors, but it is a bit cursed. This is definitely the better opening.
Code Geass: Lelouch of the Rebellion.
C2 is best girl btw

If you didn't know this song is Colors by FlOW. This is gonna be copyrighted, so enjoy the real song.
   • FLOW - Colors  

Jibun Wo sekai sae mo