Kouso is one of the main antagonists of the Koihime†Musou. She first appeared in Shin Koihime†Musou -Kakumei- Son Go no Ketsumyaku, where she is the initial main antagonist. Kouso is the leader of pirates and various bands, whose goal is to dominate China. Kouso also had two deputies, Kannei Kouha and Taishiji Shigi, but Kouso has no loyalty to either.
Kouso is a very cruel, sadistic person. Her main rival is Sonken Bundai, but Kouso hates Bundai for completely irrational reasons, this hatred is also transferred to Bundai's daughters and her friends, whom she hates equally. Kouso only desires power and sees Bundai and her Go faction as a complete obstacle. It is true that Kouso wanted Kannei to be her lover, but it seems more out of lust than out of love for Kannei, as she was not afraid to betray her subordinate and turn her over to her enemies. Kouso is also one of the few characters who is not a love interest in the Koihime†Musou visual novels.