Elfen Lied, Shinazu no Ryouken Recommendations
Elfen Lied and Shinazu no Ryouken portrays a story that has violence and tragedy. In their story, there's are individuals with a virus/disease that can potentially change the future of the world. Both series' main female protagonist gets involved with dangerous individuals in cat-and-mouse like game scenarios as they fight for what they believe in. There is experimentation, gore, and mature themes so be caution of what you'll be reading.