Koujaku is Aoba's childhood friend, though they didn't live together. Koujaku left Midori Island after meeting Aoba. Though he only recently returned, he is still very close to Aoba, and considers him more of a brother than a friend. Koujaku has many tattoos on his body and works as a hairdresser. Koujaku is very popular with the ladies and even begins to flirt with them. Koujaku's "All Mate" is a bird name Beni. Koujaku is also the leader of Benishigure. He and Noiz do not get very well together.