The Vandole Empire once tried to conquer the world with the power of Mana. The Gemma Knights fought against them to retrieve the peace, but they were losing the battle because the power of Mana was too strong. Fuji's Mother assured their victory, and she was wearing the Pendant of Mana upon her chest.
Some time later, she gave her daughter the pendant. When Sumo and Fuji finally arrives in Wendel, her mother appears before them inside the palace. Telling her daughter that they are members of the Mana Family. They are seeds of the Mana Tree, and they must guard it. The Vandole Empire abused the power of Mana a long time ago. So she sealed the Waterfalls with the pendant, so that nobody can come close to the Mana Tree. But again, another empire by the name of Glaive Empire is trying to use it for evil. Before disappearing, she tells her to guard the Mana Tree with the Gemma Knights before her figure vanishes.
Sumo meets Fuji's Mother before facing Julius. She tells him that he's become a great Knight of Gemma, and transforms the rusty sword into Excalibur before disappearing.
When Sumo delivers the final blow, the Tree of Mana disappears. Fuji wonders what she's suppose to do now when her mother appears before them. She tells them that now the tree is lost, they now need a gemma of the Mana Tree. She tells her to remember what she told before, that they are the seeds of the Mana Tree. They will be a bud called Gemma and they become a tree and the Gemma Knights fight to guard it. Fuji's Mother became the Gemma last time when they lost the tree. Fuji ask if that tree was her, and she confirms it. But, Fuji is the last member of the Mana Family. To preserve the Mana Tree, they need her to stay here and become the Gemma, but nobody else can decide what she can do with her life but herself.
Fuji decides to stay and become the new Mana Tree, but worries that if she's the last one left and when she falls. Her mother tells her that will be the end of the peace. Fuji and Sumo say their goodbyes, but reassures him that she will be here as long as he protects her from the evil. Fuji's Mother tells Sumo to guard her daughter as he's the only Gemma Knight for the Tree now. Before she withers, she ask Sumo to tell her Gemma Knights that she said goodbye and give her thanks to them. Sumo and Fuji share a last goodbye before her mother and her slowly vanishes from Sumo's sight.