Be Wary of the t/The Man Who Fell in Love with a Witch

Be Wary of the t/His Partner is the Devil

Be Wary of the t/The City’s Trump Card

Be Wary of the t/The Half-Boiled’s Pride

Be Wary of the t/The Criminal is There

Be Wary of the t/Masked Guardian Deity

Be Wary of the t/Resolving the Request

Be Wary of the t+α/The Witch Who Settled In

The Worst m 1/Valkyrie's Bodyguard

The Worst m 2/The Buzz Which Calls Death

The Worst m 3/The Threat Descended

The Worst m 4/Informant

The Worst m 5/Philip's Conclusion

The Worst m 6/White Fang

The Worst m 7/Game Over

Where Is the c 1/The Cat-finding Expert

Where Is the c 2/Call of the Beast

Where is the c 3/Where Chao Belongs

Extra Content - "Terada Katsuya Creature Design Gallery 2"

The Closed k 1/The Dynamic Duo's Disaster

The Closed k 2/Masked Nights

The Closed k 3/Drunken Demon

The Closed k 4/Serial Murders

The Closed k 5/Chain of Malice

The Closed k 6/Crimson Reinforcement

The Closed k 7/Frightening Truth

The Closed k 8/Ultimate Two in One

The Closed k 9/Until the Day We Make a Toast

The p is a Demon 1/Wandering Right Hand

The p is a Demon 2/Fully Assembled

In the ecologically-minded city of Fuuto, mysterious devices resembling USB flash drives called Gaia Memories are used by criminals and other interested parties to become monsters called Dopants, committing crimes with the police force powerless to stop them. To make matters worse, the Gaia Memories carry a dangerous toxin that cause their users to go insane to the point where they could die from the life-threatening devices. After the death of his boss, the self-proclaimed hard-boiled detective Shoutarou Hidari works with the mysterious Philip to investigate crimes which involve Dopants. Using their own Gaia Memories, Shoutarou and Philip use the Double Driver belts to transform and combine into Kamen Rider Double to fight the Dopant menace and keep Fuuto safe. 
 
(Source: Kamen Rider W Wiki) 
 
Note: Fuuto Tantei is a manga adaptation and sequel of the 2009 drama TV series Kamen Rider W.