Shunsaku Kudo

A mysterious female spy is recruited to infiltrate the Japanese underworld and gather evidence for a clandestine branch of the Tokyo Police Department. Division Zero has been charged with bringing some of Japan's most powerful criminals to justice. The organization is so secretive that few people - even within the police department - know it exists. Rei is the only female member on the force, and she'll do whatever it takes to get her man. (Amazon)

Two identical twins, Subaru and Homare, are deadlocked in a death match to determine who becomes the new leader of their clan. After the epic showdown results in near-fatal injuries for the two, Subaru is saved by a group of happy-go-lucky Yakuza. As Subaru slowly gets acclimated to the world outside his ninja training and learns the way of the Yakuza, Homare lurks in the shadows, waiting for the right moment to strike down his brother once again in order to achieve ninja supremacy.