Kamen Rider W(2009)

This clinches it!

Kamen Rider W is a Japanese superhero series set in the windy city of Fuuto, where detective Shotaro Hidari and his enigmatic partner Philip merge into a single warrior to become Kamen Rider W. Together they battle Dopants—monstrous beings born from Gaia Memories, powerful artifacts that corrupt their users. The series blends detective noir with tokusatsu action, following Shotaro and Philip as they investigate the source of these dangerous items while protecting their city. Their partnership is central to the story, as the two must literally combine their strengths to transform and fight. Kamen Rider W explores themes of duality and cooperation against a backdrop of mystery and high-stakes superhero combat.