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Shuuyu Koukin  ( (しゅう) () 公謹 (こうきん)? Zhou Yu - Gongjin), also known as Meirin  (冥琳 (めいりん)?), is a strategist of Go, Hakufu's lover, and one of the secondary protagonists and heroines in the Koihime†Musou series.



The strategist of the Go kingdom whose brilliance is said to rival Shokatsuryou.
Following the defeat and capture of Sonken and Sonshoukou, she immediately abandons the two and leads Go herself. After being dealt a crushing defeat by the Hongou army, she commits suicide by setting the palace room on fire and staying in there, not before stating that she had no regrets and knowing that she will be reunited with her lover Sonsaku in the afterlife.
In the harem ending, she is brought back from Kazuto's memories. Being in a world where Sonsaku never existed, she is finally free from the burdens which chained her throughout the entire plot and makes peace with Sonken.

Shin Koihime†Musou[]

Go Route[]

In the Go route, Shuuyu serves as a mentor to Kazuto after it was decided that he is to become a strategist.  
She eventually dies in action at the end of the campaign after the Gi faction is defeated. 

Gi Route[]

Shoku Route[]

She survives, however, in Moeshouden ​which follows the Shoku route ending. Here, she remains content with spending her days in peace with Sonsaku and Kazuto. Her sickness is mentioned once more though it no longer causes her death as Sonsaku, and to a lesser extent Kazuto, take care of her.


Shin Koihime † Eiyuutan []

Shin Koihime † Musou -Kakumei-[]

Souten no Haou[]

Son Go no Kechimyaku[]

Ryuuki no Taibou[]

Anime version[]

Go Kingdom's master strategist.
She is a close confidant and lover to Sonsaku. Like in the VN, she understands her queen's ambition. She has sworn loyalty to her until their task is done.



Her personality differs significantly between the first and second VN.
As a major antagonist in the first VN, she is portrayed as a very serious woman who dedicates herself to carry out Sonsaku's goal of unifying China. As a result, she is often discontent by Sonken's lack of ambition and views the young ruler as being unfit for the throne. In fact, she holds no loyalty to Sonken and acts only according to what she perceives as the best for the Go faction; her loyalty and affection for Sonsaku goes so far that she is willing to sacrifice everything else for Sonsaku's dream, even collaborating with Ukitsu and continuing to attacks on Hongou faction despite Sonken and Sonshoukou being taken captive.



  • During the first game, her given name was misspelled, using the character "喩" rather than "瑜". This was corrected from SKM onwards.
  • Meirin took the tenth place in the poll of the most popular character in the story company Go.[1]