|Primary User||Holy Britannian Empire|
|Appears in||The Black Knights|
Lake Kawaguchi (河口湖, Kawaguchiko) is a famous Britannian tourist spot, and is the site of the Annual Summit of the Sakuradite Producing Countries. It is the setting of a hostage incident instigated by a branch of the Japan Liberation Front under the leadership of a man named Kusakabe. The incident is resolved by the combined efforts of Cornelia and The Black Knights.