is a series conceptualized by voice actor Takehito Koyasu about four assassins that work in a flower shop called "Kitty in the House". The assassins are members of a group called Weiß (white), which is run by Persia of the mysterious Kritiker organization.

The Weiß Kreuz franchise includes two seasons of anime and one OVA series, a light novel, two manga series, and several drama CDs. The four voice actors of the main characters – Koyasu, Hiro Yūki, Shin-ichiro Miki, Tomokazu Seki – formed a band named "Weiß"; several CDs and singles were released. Media Blasters released the anime in the North America as Knight Hunters: Weiß Kreuz.

Plot Four young men consisting of Omi Tsukiyono, Ken Hidaka, Youji Kudou, and Aya Fujimiya, are members of a group of assassins called "Weiß". They cover their operations by working at a flower shop during the day and solving crimes and fighting villains during the night. This is no ordinary group: they kill murderers, big corrupt businessmen, and other assassins and criminals that the law cannot touch. Each one is fighting for their own reasons, whether it is for revenge or to help the people that they care about. But they soon realize that there are connections between some of their cases and try to find out what is really going on behind the scenes. They use whatever they can to complete their missions and kill the people that are targeted by Weiß's mysterious leader known as Persia.

Characters Weiß An assassin group that is under the order of Kritiker ("critic" in German), a secret organization that falls under the Japanese police force.

Codename: Abyssinian

He is known as , the name that belongs to his sister who is in a coma. His parents were killed and his sister was run over by Reiji Takatori, causing him to join Weiß seeking revenge.character profiles on the Marine Entertainment website (in Japanese) Aya's weapon is a katana named "Shion" after the previous owner and Aya's teacher. Before Aya became Weiß, he was a member of Sendai Kritiker, Tsushima Kritiker and Tokyo Crashers. Aya's car is a white Porsche 928.

Codename: Bombay (Weiß Kreuz), Persia (Weiß Kreuz Glühen)

Due to his computer skills, is in charge of gathering information and planning Weiß's missions. He uses a crossbow, bow and poisoned darts as his weapons. Omi was kidnapped when he was eleven, and as his father refused to pay ransom, he was saved by Persia who trained him for a killer.All That Weiß - A collection of all Weiß stories, for all Weiß fans, May, 2000. (in Japanese) Omi lost his memories due to shock and doesn't remember his life before Kritiker at the start of the series, but as the action unfolds he discovers he is in fact , son of Reiji Takatori - head of the Takatori family, who are in some way related to almost all the missions the boys have to take. Later, in the Dramatic Precious drama CDs, he finds out that he is really Shuichi Takatori's biological son. He assumes the position "Persia" in Glühen.

Codename: Siberian

was once a talented professional soccer goalie in the J-League, but he was forced to quit due to a gambling scandal, despite the fact that he was completely innocent. Before he became one of Weiß, Ken was a member of Kagoshima Kritiker and underwent a mission on Yakushima Island.

Codename: Balinese

is a ladies' man and a former private detective. It is that he once ran a Private Investigator Agency with his first love, a young woman with sunglasses and a distinctive beauty mark named Asuka Murase. Asuka, however, was shot and killed while investigating the members-only Liott club, which hides a prostitution ring. He joined Weiß to protect all the other women of the world because he couldn't protect his love and partner, and this explains his insensitive-seeming practice of only accepting missions that have to do with women of legal age. Previously a member of Kobe Kritiker.

Kritiker

The head officer of the police force by day and head of Kritiker, an underground organization fighting for justice, by night. His real name is and he is Reiji Takatori's brother and Omi's biological father (with Reiji's wife; that is the reason why Reiji did not pay the ransom for Omi when he was kidnapped). Persia's codename for Kritiker is "Marigold", and "King" for Crashers.

Persia's red-headed secretary, whom Yoji always flirts with but never gets anywhere with. She has feelings for Shuichi Takatori, but does not act on them due to their professional relationship and his remaining love for his brother's late wife. Manx is a cold and calculating woman who doesn't let the personal feelings of Weiß members influence her decisions. She uses the codename "Erika" when dealing with the non-lethal Kritiker teams. Her real name is .

In the early CD drama Birman is shown serving as a liaison between Weiß and Persia, along with Manx. In the anime she is introduced after Shuichi Takatori's death, as a private secretary of the new Persia, Yoshirou Karasuma. Like Manx for Shuichi, Birman also has feelings for the man she serves.

A Kritiker agent who assists Birman in guiding Weiß, and takes a particular interest in Aya due to his own personal reasons for joining the organization. He later dies in episode 17 from being shot, put on fire, and thus burned to death. His codename means "peony".

Takes the position of Persia after Shuichi Takatori.

Civilians

The younger sister of Ran who was run over by the car of Reiji Takatori on her sixteenth birthday. She has been comatose ever since. Despite the fact that she is now eighteen years old, her body has not physically aged at all. As a result, she becomes a target of Schwarz. Aya is commonly referred to as Aya-chan to differentiate her from her older brother.

A girl with a striking resemblance to Aya's younger sister. She becomes quite close to Aya, who pushes her away because he fears she will be in danger if she comes to know him, and somewhat because her resemblance to his sister brings him pain. She uses her physical resemblance to Aya's sister in order to protect Aya-chan from Schwarz later on. In the Dramatic Precious drama CDs she eventually goes abroad to study in Paris, France, acknowledging her feelings for Aya have been fading.

A frequent patron of the flower shop, Ouka is a privileged schoolgirl who is especially fond of Omi. Unfortunately for both of them, she is also Reiji Takatori's illegitimate daughter, which results in her being caught up in Weiß's struggles against Schwarz and the Takatori family; the consequences, described in both the anime and the CD dramas, are especially gruesome; in the anime, she is accidentally killed by Schwarz, and in the Dramatic Precious drama CDs it is revealed that her body, along with her older brothers', has been preserved.

The kindly owner of The House of Kittens, the flower shop where the members of Weiß work. Her lazy white cat always sleeps on her lap, occasionally looking up when interesting things happen in the shop. Generally, however, neither Ms. Momoe nor the cat see any action. Her full name is .

Enemies Schwarz The main enemies in the series are another group of assassins called Schwarz ("Black" in German), all of whom have supernatural powers. Schwarz begrudgingly work as bodyguards for the Takatori family, and this is how they meet Weiß. Later in the series, Schwarz is seen assisting a mysterious group known as "Eszett" (the name of the German alphabetic character ß) in resurrecting their deceased leader. Weiß is to Kritiker what Schwarz is to Eszett.

Crawford is the leader of Schwarz. Though Crawford seems to follow commands without so much as a question, he is not someone to be trusted. He is very focused, although what drives him is unknown. Crawford has the ability to see bits and pieces of the future. Because of this, he has shown to be quite difficult to deal with on more than one occasion. He is 27 in the first anime.

Both sadistic and masochistic to an extent, Schuldig enjoys messing with people's heads, which is all too easy given his power of telepathy. He claims that people's minds taste like honey; however, he also complains that at times he can't tell which thoughts are his. Schuldig means "guilty" in German and Dutch. He is 22 in the first anime.

Nagi was shunned as a child by the people around him because of his telekinetic powers. He was living on the streets for quite a long time, then taken in by a nurse who led an orphanage. Due to the fact that the nurse actually was using the children living in the orphanage to commit crimes, Weiss was ordered to kill the nurse. Ken, who knew a girl from the orphanage and thereby got to know Nagi as well, was the one to kill the nurse. Nagi witnessed the murder and as a result he made the church collapse by using his telekinetic powers - and from there on hated Ken in specific. He ran off and found shelter at Crawfords, who then took him in. Then he started to work with and for Schwarz to get revenge on both Ken and the world for the way everybody treated him when he was a child. He is very solemn and embittered towards the world. He is 15 in the first anime.

Called demented by most, his multitude of scars and ability to grin at insane acts of violence toward others and himself makes this accusation seem true. His real name is Jei. When he learned as a child that his real mother was Ruth, the nun who had been his teacher, Jei snapped and murdered his adoptive parents and sister, then blocked out the memory, developing a vendetta against God and Christians. In the Dramatic Image albums III and IV, he and Schwarz meets a young woman named Sally Schumars while on the run. She is a timid witch who is trying to escape from Rosenkreuz, a group of people with special gifts similar to Schwarz's, and Schwarz has a complicated history with the Rosenkreuz organization. Farfarello and Sally fall in love, one of the main reasons being given is that she makes him feel again. At the end of the fourth Dramatic Image album, he and Sally part from Schwarz with Schwarz's sort of "blessing." Farfarello's name comes from one of the demons in Dante's Inferno. He is 20 in the first anime.

Schreient A group of four female assassins employed and cared for by the scientist Masafumi Takatori. They are fiercely loyal to him and one another. "Schreiend" is the German word for "screaming."

She is the leader of Schreient, carrying out her lover's will. She was once a member of the Japanese Self Defense Force. She is normally level-headed, but can be moved to great anger. Hell means "bright" in German, and her real name is Chizuru Aoi.

She was once a model, and has more than a healthy appreciation for her own beauty: it is a scratch to the face that angers her the most in one battle. While she seems very self-absorbed, she does not put herself before the rest of Schreient. Schön means "beautiful" in German, and her real name is Karen Kitaura.

A strike to her face in one battle breaks her visor and reveals to Yoji the eyes of someone he believed dead: his ex-lover and partner, Asuka. The anime never conclusively states whether she is or is not, but it is confirmed in the All That Weiß official artbook that Neu indeed is Asuka. After Youji lost her, she was forced into prostitution, then sold as a guinea pig to Kourin. In episode sixteen, she uses the name "Kyoko" when she tries to seduce (and then kill) Yoji. Neu means "new" in German.