Kochou (蝴蝶, Kochou) is a famous courtesan in the red-light district. She manages Kougaro, the number one brothel in Kiyou. She is actually one of the underground bosses of Kiyou.

When Shuurei was young, she came to wark as an accountant in Kougaro, and two developed a close friendship. To Eigetsu woke up unconcious in Kougaro, and eventually met Shuurei and her group. When Shuurei went to take the imperial exam, Kochou gifted her a make-up box, saying that the make-up is the women's battle armour, because when a women wears a make-up, she will not cry since tears will ruin her make-up.