Summary of Choujin Densetsu Urotsukidouji.

Young kendo prodigy Ranmaru Samejima captures the attention of Kei Enjoji, the illegitimate son of a yakuza boss. Kei, determined to form a bond with Ranmaru, cultivates a friendship built on trust and sacrifice, which soon turns into love. After saving Kei from a yakuza hit-and-run attack, Ranmaru is forced to give up kendo forever, and the two are left with only their faith in one another. Vowing to support each other far from the world of the yakuza, the two begin living together as a couple. However, when a mysterious figure from the pair's past returns in pursuit of Ranmaru, they are thrust back into the world they fought so hard to leave—and their love may not be strong enough to survive it.

For some individuals, baseball is more than just a game. Momokitchi Momoi, an underworld boss and the owner of a professional team known as the "Peach Twisters," seems to be the perfect example. There is only one punishment for players who have let him down: death. Terrible as he may sound, there is someone even more wicked than him—his daughter, Momomi. The three members of the Danger Service Agency—Mikura Suzuki, Tomohisa Harada, and Kenichi Kurokawa—are tasked with kidnapping Momokitchi and taking down his criminal empire. Surrounded by armed bodyguards, he is bound to be a risky target. However, born with a gun in hand, Mikura is used to dancing with danger. The only unknown quantity is Momomi, reputed to be a cold-blooded killer with a twisted mind. Should she stand in the DSA's way, Suzuki might finally find herself a worthy opponent.

The story is set in the future on the planet named Amoi which is controlled by a supercomputer named Jupiter. Among the mostly male human population, the light-haired elite class is allowed to temporarily keep the dark-haired "mongrels" as pets. One elite member, Iason, encounters a mongrel named Riki in the slums and decides to take him in. However, Iason keeps Riki longer than it is socially approved, and rumors abound about their possible relationship.