In the world where the warriors exist, there will be a strong power to come to claim as a ruler. A leader of a ninja clan appears with a biological knowledge and uses his cognitive content to develop a new type of virus to create a bedlam toward other ninja clans. Izuna, in his late teenage years, has been dispatched on a mission to retrieve a lady from another clan who possesses an antibody against that virus. In a journey full of jeopardy in every corner, a man emerges as a threat in silence. At the same time, who is that mysterious woman in the cloak? Why is she so keen to hunt him down? Justice, mankind, confusion, hatred, vengeance, and love-all of that are mixed together. In order to bring back serenity in their entire country, he needs to accomplish his mission, one way or another. That's it. Run, run, and keep running even if it is so hard to face it. Live. You need to live and struggle to survive, to find peace, and bring it to brighten up the world. Is that horrifying virus outbreak really their main trouble?