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Alka, a sword-woman with proficient skills, defeats foes by a single stroke. She travels with an aim to avenge her master, Hong's death, of which vendetta was required by the rules of the tribe she belongs to.
After Akira and his sister Kaori are falsely assumed dead in the accident that killed their parents, they are now seeking revenge on the organization responsible for the deaths, even if it means breaking the law. Weiss Kreuz is asked to stop this duo from committing their illegal activities, but Aya and Yoji are the only two who accept the mission. While carrying out their plans, the entire Weiss team finds themselves in the lair of death and deceit. Will the organization's ruthless plan mean the fall of Weiss?
Former roller-skating delinquent Tomoe Oujima has been scouted by stunt training school Green Ship. Her romance with trainer Kazusa Himuro is cut off when she discovers that the school is secretly training assassins and guerrilla fighters. An undercover cop asks her to warn one Iori Toujou that he's being targeted. When Tomoe reluctantly escapes from Green Ship and goes to warn Toujou, she finds that he's the adopted heir of a business magnate whose family wants to get rid of him, and Himuro's organization has been hired for that job. Tomoe vows to protect Iori from Kazusa.
Aya, Omi, Ken and Yoji are four seemingly normal high school boys, who make up an elite assassin group known only as Weiss. The hits involve taking out corporate businessmen and corrupt politicians; however, trouble arises during a routine job, when Weiss clashes with a rival gang of assassins, Schwarz. With Schwarz in the way, they will reach the limits of their elite skills while trying to defeat their ultimate target: the Takatori family...
In a city laced with crime, four individuals face their own personal trials. Mihai, a middle-aged hitman, seeks closure with an old student; Badou the information dealer learns a little too much; Naoto, an orphaned girl, lives for revenge against her parents' killer; and Heine, the result of underground genetic experiments, hopes to save another like him. Each must find the strength to overcome their dilemma and continue to live in this tough world...
Raizo Kurima is a man who was betrayed by someone he trusted, and now he has no place to return. He is now a hitman working for the organization Revenger, which takes revenge on behalf of those who have no power. He works at the "Ribenjiya" store that acts as a general store on the outside while hiding the Revenger organization beneath the surface. His coworkers include a physician with destructive impulses, a beautiful and androgynous young man who is both cruel and innocent, a gambler who loves money and alcohol, and an intelligent lacquer craftsman. The five men start to build a strange friendship by working together.
Beneath the earth’s surface lies the unknown world, Endra. After touching a mysterious crystal, Shun Asanaga finds himself in this new land and his only way home lies with helping the vengeful Prince Emilio. Recently imprisoned, Emilio vows to take back his rightful throne from King Delzaine.
There is trouble afoot at Koua Academy, home of an intellectually elite selection of students and teachers. The mysterious S-Class is not only the best of the best, but the superior force behind the actions and administration of the entire school. However, a recent chain of suicides has raised the attention of more than just the media. Weiss must band together for one last mission: to hunt down the evil mastermind responsible for the suicides and secret experiments at Koua Academy: Epitaph.