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.

On the planet Earthdash, its inhabitants gaze on its moon and the technologically advanced lunar city of Mooneyes with awe. Dan JD, a boy living in Rollingtown on Earthdash's surface, gets caught up in Bigfoot Basketball—a fast-paced sport played with giant Bigfoot robots. (Source: AniDB)

Hacka Dolls are AI that scan a person in order to tailor news recommendations and information to their users. These widespread, personalized robots have served many citizens, from government officials to professional sports players. A severe drop in quality leads to the production of three substandard Hacka Dolls. Due to their personality defects, they are sent to Earth, tasked with advancing humanity in whatever way they can. Whether it be encouraging a fujoshi to sell a doujinshi at Comiket or performing in an idol group, the three dolls will complete any task as long as it abides by their moral compass. Despite their shortcomings, they take their mission very seriously and always try their best to assist everyone with incredible enthusiasm.

Defense attorney Ryuuichi Naruhodou is still hard at work defending the falsely accused with his knack for last-minute turnabouts. With his trusty assistant and medium-in-training Mayoi Ayasato in tow, Ryuuichi's fame as a champion for the innocent steadily grows. But this newfound success attracts the attention of the coffee-loving, masked Godot⁠—a mysterious rookie prosecutor who bears an inexplicable grudge against Ryuuichi. With the help of their allies, Ryuuichi and Mayoi take this new challenger head-on and search for the reason behind his appearance. But before long, the first two cases from the career of Mayoi's late sister Chihiro Ayasato become critical to solving a fantastical murder mystery, continuing the bloody saga of the tumultuous Ayasato clan. Will Ryuuichi once again be able to overcome the odds and find the truths hidden within the web of lies?