Quick answer — Tsutomu Kuroiwa worked on One Piece Film: Gold (Script), GANTZ:O (Script).
OP
One Piece Film Gold opening - Silver Ocean -
ED
One Piece Film Gold Ost - Daigyakuten
Frequently Asked Questions
What anime has Tsutomu Kuroiwa worked on?
Tsutomu Kuroiwa worked on One Piece Film: Gold (Script), GANTZ:O (Script).
