Third-year high school student Jirou Yakuin is in love with his childhood friend and classmate, Shiori Sakurazaka. Thus, he hopes to be paired with her for the marriage practical: their school's practice of randomly selecting boy-girl pairs to live as pretend married couples while monitoring and rating them on how close they have gotten. Meanwhile, the lively Akari Watanabe wants to be assigned to her crush, the popular and good-looking Minami Tenjin. Much to their dismay, Jirou and Akari find out that not only have they been paired together, but so have Shiori and Minami! Determined to be with their crushes, Jirou and Akari strive to earn as many points as possible, as the top 10 pairs earn the right to switch their partners—so long as both couples agree.

Shoutarou Hidari, a hard-boiled private investigator from the Narumi Detective Agency, lives for the sake of protecting the peace in the city of Fuuto alongside his inquisitive partner, Philip. One fine night, Shoutarou encounters a mysterious woman named Tokime, who is soon linked to several cases of homicide and theft. Shoutarou's investigation leads him to people using Gaia Memories—memory units similar to thumb drives holding vast amounts of data—to turn into formidable beasts called Dopants. While the majority of Gaia users were put down by the detective team in the past, a number of them still remain, posing a great threat to public safety. Once more, Shoutarou and Philip, Gaia users on the side of justice, must fight as Kamen Rider W—the renowned hero safeguarding Fuuto—to eradicate the nest of villainous Dopants, all while uncovering Tokime's true identity and confronting the long-forgotten past.

Wasted from the night before, Kaede wakes up the next morning to find herself at home with a dinosaur she had brought along with her. The two start living together as an odd pair consisting of a typical gal girl and a mute dinosaur going about daily lives. Although not the most experienced paleontologist, Kaede begins to learn more about her new prehistoric roommate through a series of comedic gags and adventures.

Fujita Reiji is the owner of an art gallery, Gallery Fake. He deals with fake items, and is also familiar with the black market. However, he has a special talent for art, and used to work for the Metropolitan Museum of Art in New York as a curator. (Source: ANN)