Kotetsu is the reason why Weed and Koyuki met. Kotetsu, who was at the age of hyperactivity and rebellion, ran away, causing Koyuki, his sister, to come looking for him. Koyuki however gets caught in a trap and Weed saves her.

Koyuki tells Weed of Kotetsu and Weed, who has already developed feelings for Koyuki, tries to find Kotetsu. (Koyuki still has not developed feelings for Weed). But when Weed meets Kotetsu, he is being bullied by a group of older (but still not as old as Weed or Mel) rogue dogs led by Yuusuke. The rogue dogs are eager to defeat their trespasser and they chomp off Kotetsu's tail. Weed rescues Kotetsu scaring the pack of rogue dogs away and brings him back to his worried sister. When Koyuki sees how Weed has saved her beloved brother, she begins to like him, visiting him more and more until they fall in love. But when Weed has to leave for Hokkaido to save his father Gin, Koyuki, devastated, stays with Kotetsu hoping Weed will return soon. Koyuki and Kotetsu (who has developed feelings for Weed as an older brother) understand that Weed has certain duties as the Leader of Ohu.

Kotetsu in Ginga Densetsu Weed: OrionEdit

Latest spoilers have confirmed that Kotetsu escaped the earthquake (with Gin's group), and is working as a spy in the Kurohabaki clan. He was also burnt and scarred by the fire.

See more pictures in Kotetsu (Photo Gallery).