Weiss Kreuz

Weiss Kreuz was an anime about four guys who worked in a flowershop by day and were assassins by night. The team of Weiss was comprised of Fujimiya Aya (Ran), Tsukiyono Omi, Hidaka Ken, and Kudou Yoji, and all of them had specific character traits and horrible pasts which led them to their lives as assasins.

From wikipedia:

Weiß Kreuz Kapitel

Kapitel is the first of the Weiß anime series. It runs 24 episodes and follows Weiß in its mission to “defeat the dark beasts” that haunt Tokyo. The beginning episodes lend some back story to Aya, Ken, and Yoji, and show their motivations for being in Weiß. Omi’s history becomes part of the Kontakt storyline and is delved into halfway through. Kapitel introduces Kritiker, Schwarz, Eszet and Schreient. Kaptiel uses the character designs created by Kyoko Tsuchiya, and features the lowest quality of animation of the three Weiß Kreuz anime series.

Weiß Kreuz OVA : Verbrechen & Strafe

The second Weiß series, “Verbrechen & Strafe” (crime & punishment), is a two-episode OVA that takes place a short time after the end of the anime, and before the events detailed in the last set of Drama CDs. In hiding, Aya, Ken, Yoji and Omi work out of a mobile home, using their flower-selling business as a cover. Their location is never specified, but it is possibly in the area of Yokota Air Base or Camp Zama, which are both American miliary bases near Tokyo. Their first mission involves a target by the name of Col. Nichol who evidently has his own enemies in a later target for Weiss, a young man named Akira. However, Ken and Omi decide to decline the mission to kill Akira after they hear Akira’s (and his younger sister Kaori’s) story. They only want revenge on Nichol for killing their parents several years before. Kaori was also a classmate of Omi’s and the only surviving member of her group of friends, all supposedly killed by Nichol. Kritiker doesn’t take to Ken and Omi’s defection, and amends the mission. Yoji and Aya are instructed to target their team mates as well.

The OVA is notable because of the darker, bloodier storyline and the higher quality of animation compared to the first series.

Weiß Kreuz Glühen

The third series, called “Weiß Kreuz Glühen,” (white cross glowing) is a 13-episode series which is set after the first. Several of the original Weiß members are not immediately visible; two new ones are introduced in the first episode: namely, Izumi Sena and Aguri Kyo. Also, Omi has assumed the position of Persia left by his father. Glühen takes place at Koua Academy. The animation quality is far higher than the original series. However, the character design is vastly different due to legal disputes with the original character designer, Kyoko Tsuchiya. The new character designs are a point of polarization among WK fans, with some fans adoring them and others reviling them. Schwarz also appears in Glühen; they also have changed appearances due to the lawsuit.

Spinoff

Koyasu also created the radio play “Crashers: Knight and Ran.” This spinoff covers the time that Aya (Ran) spent with Crashers (another 4-person group that is also under Persia) before he joined Weiss. Crashers also appears in Weiß Kreuz Glühen.