A Different Monster

Izaya Orihara X Yuu Kami (A DRRR OC)
Main story takes place sometime after Izaya Orihara had been released from the hospital after the stabbing incident. It doesn't follow Durarara canon after that, as it wouldn't focus on the plot being directed out by me myself and I for the sake of giving my favorite asshole an actual love interest.

Yuu Kami was a Monster created by Yagiri Pharmaceuticals, as they accidentally broke her bones in an endurance test, learning that was how Shizuo Heiwajima gained his strength. They wanted to push the limits of human strength, as this was an experiment they had no regard for her mental health. She remained strong mentally, only to finally be freed by circumstances unknown to her until after her escape.

The first chapter is background, laying down information for how she got to know her friends. The story style changes after the initial chapter, as it goes more into romance than informative text.