Kamareucho, one of the oldest, and most popular, centers of entertainment in the Neighponese city of Pokyo. Twilight Sparkle, known as the Dragon of Celestia, is the fourth Chairmare of the Pojo Clan, one of the largest, and wealthiest Marekuza clans. Tasked to protect the child of two important associates, Twilight begins to question whether what she does is justifiable or not.

(Despite the image, the story is full pony, Only decent one I could find, crossover with the Yakuza/Like A Dragon game series.)