She is the queen of Utakata Village which is located afar from Reco's village Hoshifuri, and is the subjugator of dragons who uses the said beasts to guard her castle. One day insects from Shinjuga Forest attacked Utakata village suddenly and unexpectedly. Aki, Larsa's oldest son and her favorite, volunteered to go to war against Shinjuga insects to defend his mother and her kingdom. However, the war dragged on and Aki decided to go to Shinjuga Forest alone and take the fight to insects' home ground.
Shortly after insects' attacks on Utakata Village ceased, but Aki did not return. Fearing for Aki's safety Larsa dispatches reconnaissance detachment to Shinjuga. The reconaissance arrived to the forest just in time to witness Aki dying in Reco's arms. The reconaissance unit hastily returned to Larsa's castle and reported what they saw. Thinking Reco is responsible for her Aki's death,(which was not the case, as Aki sacrificed himself so Reco could become goddess of the Koju to protect humanity) Larsa was livid with fury.
Blinded with rage and with only vengeance in mind, she forcefully tamed dragons and sent them after Reco, along with her unsuspecting youngest son Palm with the promise of kingship. But with six more sons to replace Palm, she sent him to his death and actually expects Palm to die since she only favored Aki and knowing the poisonous atmosphere of Shinjuga Forest would kill him.
After much fights and misadventures Palm ends allying himself with Reco to stop his mother. As the two make their way into her castle they attempt to convince her that Reco is a good person and Reco is not responsible for Aki's demise, Larsa is so blind with her rage she would not listen to reason. After coldly sentencing Reco and her own son to death Larsa promptly attacks them, ending up being killed after a long fight.