Kotetsu

Breed: Kishu Kotetsu is Koyuki’s younger brother. He find Weed’s pack and asks where his sister is. When the pack cannot help him, he goes out to search himself. Soon he meets Weed who aid him in a fight against the stray Yuusuke and his gang. Kotetsu however looses his tail during the fight. When Koyuki is taken away by their master, Kotetsu runs to Weed to tell him what has happened. Afterwords, we don’t see Kotetsu for a long time. However, Kotetsu miss his sister so much that he starts a journey to find her. When Kotetsu finds her, Weed leaves the care of Koyuki to him, because Weed has business to do in Hokkaido. (source: GingaSite.net)