Two years ago, Train, a high-level assassin known as Number XIII in Chronos, left the secret society to live by his own rules. Since then, Train has been a sweeper, a bounty hunter, catching criminals and bringing them in alive. But his main mission is to find a former Chronos member who killed his best friend.
Kentaro Yabuki is a Japanese manga artist. His mentor was Takeshi Obata, the illustrator of Death Note, Hikaru no Go and Bakuman. Yabuki is best known for his series Black Cat which ran from 2000 to 2004 in Weekly Shounen Jump and later adapted into an anime. Upon its ending, Yabuki expressed desire to make a sequel from the series, or make its characters reappear in another work. Since 2004, he has only been working as illustrator to works written by other authors. Most notably on the series To Love-Ru alongside his former assistant Saki Hasemi.