This is an old anime, but I only recently found out about it. More notable than the story is the overflowing homage. The opening songs all sound familiar.
Sadly, I only got to see maybe the first episode & a few scenes from the anime TV show
The Big O back when it came out years ago on Cartoon Network / Adult Swim / Toonami.
Toonami - Big O Longer Promo (1080p HD):
I need to go back and watch all of it one day, thank you for reminding me,
@show-Zi.
One thing that stuck with me though was some of the music, like the song Apologize, which I have in my music collection until this day:
Apologize: