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Official Site:  Nahoko Uehashi

is a Japanese novel that was first published in July 1996. It is the first in the 12-volume series of Japanese fantasy novel by Nahoko Uehashi. It was the recipient of the Batchelder Award An ALA Notable Children's Book in 2009. It has since been adapted into numerous media, including radio, manga, , and taiga drama adaptations. Scholastic released the first novel in English in June 2008. Media Blasters has confirmed that they acquired the rights to the anime. The anime series adaptation premiered on Adult Swim in the U.S. at 1:30 a.m. ET on August 24, 2008, but was dropped from the schedule without warning or explanation on January 15, 2009, after two runs of the first ten episodes. The program returned to Adult Swim during the summer 2009 line-up with an airing of the entire series.

Balsa, spear wielder and bodyguard, is a wandering warrior who has vowed to atone for eight deaths in her past by saving an equivalent number of lives. On her journey, she saves Prince Chagum and is tasked with becoming his bodyguard. His own father, the Mikado, has ordered his assassination. The two begin a perilous journey to ensure the survival of the prince. Balsa's complicated past begins to come to light and they uncover Chagum's mysterious connection to a legendary water spirit with the power to destroy the kingdom.

The novel was first published in hardback by Kaiseisha as children's literature, but it had many adult fans. Shinchosha republished it in bunkobon format in March 2007.

; Seirei no Moribito (Guardian of the Spirit) ( , 1996-07) (Bunko , 2007-03)

Balsa Yonsa has not been a contender in any CBUB matches.