K: Stray Dog Story

K: Stray Dog Story is a manga prequel to the anime K. It is written by GoRA and illustrated by MINATO Saki, and has been serialized in Kodansha's good! Afternoon magazine since November 7, 2012.

Summary
Kuroh Yatogami has lost the only thing remotely close to family he had left—and to make matters worse, he’s been charged with a final task by his master that he isn’t entirely sure he’ll be able to fulfill. Follow this young modern-era samurai as he sets off on a quest to track down the next Colorless King and determine if he’s evil or not…and to strike him down where he stands if he is.