Kamen Rider W

This clinches it!

Genres: Action & Adventure, Drama, Mystery, Sci-Fi & Fantasy, Kids

Counries: Japan

Companies: Ishimori Production, TV Asahi, Toei Company, ADK

Seasons: 1 (49 episodes)

In the windy city of Fuuto, detective Shotaro Hidari and his partner, the mysterious Philip combine to become the two-in-one Kamen Rider, W in order to fight creatures called "Dopants" that abuse the power of items called Gaia Memories.