The younger daughter of the Tsuchimikado family. She participates in the Granblem in the hopes of finding a cure for her sister Shisui, who has fallen into a magically induced coma.
She later becomes enemies with Suishō, suspecting that she is responsible for her sister's condition. She also agrees to an alliance with Mangetsu and Shingetsu, so they can survive the Granbelm.
Kuon is one of the very few that remembers Anna after her defeat in the Granbelm causes her to be erased from history.
As the Granbelm continues, Kuon realizes Suishō consumed a part of Shisui's soul and Suishō uses this particular information in an attempt to demoralize Kuon, but Kuon later discovers that Shisui only did that so that Kuon could have a chance at winning the Granbelm. Despite her renewed efforts, however, Kuon is killed by Suishō and the Magiaconatus alters reality so that everyone, except the remaining Granbelm fighters, forget she ever existed, much like Anna before her.
Her Armanox is the Setsgetsu Baika (雪月梅花, Setsugetsu Baika), which can manipulate the environment and uses light-generated fans for battle.
