The story centers around millionaire Daisuke Kambe, the heir to one of the wealthiest families in Japan, who is assigned as a detective to the Modern Crime Prevention Task Force (aka MCPTF), at the Tokyo Metropolitan Police Department. Taking full advantage of his vast family wealth, he spares no expense in solving complex crimes, and has the tendency to evaluate everything including individual human lives in terms of their monetary value. Haru Kato, a detective with a compassionate heart who believes that money isn’t everything, is chosen as Kambe’s partner but is repulsed by his materialistic attitude. Having diametrically opposing personalities, witness how the two join forces to tackle seemingly unsolvable crimes and mysteries!

Bayron City -- a Mega-Float type city in the Pacific Ocean, which doesn't belong to any particular nation. As the mine for Orgonium, a new energy resource, this city is the most noticed in the world right now, and here special cases caused by demons called "D Hazards" has been occurring frequently. Only a handful of people know about the existence of D Hazards. They are handled by PMCs (Private Military Companies). Shu is a young man living in Bayron City who runs such a company, but his company is tiny. On top of that, he cherry-picks his jobs, so he is always in a bind for money. His life, both publicly and privately, is being supported by the beautiful high school girl Kisara who attends a school in Bayron City.

Ryza is an ordinary girl. Tired of boring village life, she escapes the village to gather with her good friends in a secret location to talk of their dreams and plan thrilling adventures. One day, the determined Ryza and company decide to head for the forbidden "island across the shore" as their first exploration trip. Together with the alchemist and other friends they meet there, they have a "summer adventure" that they will never forget.

The story follows a group of high school girls who are in the 'Going-Home Club'. Instead of doing regular club activities, the 'Going-Home Club' is dedicated to having as much fun as possible, by doing such things as playing video games or even simply feeding pigeons in the park.

Erika Shinohara has taken to lying about her romantic exploits to earn the respect of her new friends. So when they ask for a picture of her "boyfriend," she hastily snaps a photo of a handsome stranger, whom her friends recognize as the popular and kind-hearted Kyouya Sata. Trapped in her own web of lies and desperately trying to avoid humiliation, Erika explains her predicament to Kyouya, hoping he will pretend to be her boyfriend. But Kyouya is not the angel he appears to be: he is actually a mean-spirited sadist who forces Erika to become his "dog" in exchange for keeping her secret. Begrudgingly accepting his deal, Erika soon begins to see glimpses of the real Kyouya beneath the multiple layers of his outer persona. As she finds herself falling for him, she can't help but question if he will ever feel the same way about her. Will Kyouya finally make an honest woman out of Erika, or is she destined to be a "wolf girl" forever?