Bleach:Experimental Wilds

Bleach: Experimental Wilds (ブリーチ: 実験的荒野, Burīchi: Jikkenteki Kouya) is a spin-off of the series Bleach by Tite Kubo, written by Ryo, dealing with the lives of three escaped experiments of the Shinigami Institute of Research and Development

Plot
In the quest for knowledge and desire to create and experiment, The Shinigami Institute of Research and Development has taken to experimenting on living subjects, each with a different goal in mind. Three have escaped. One cannot be found, one does not wish to be found and the last if officially not recognized as existing. One is unstable, one harbors a madman and the last could very well doom everyone.