Rasati Fadeless, known also as Rasati Tigres, emerges from Razfe Ankul's illicit Milliard Trey arena as the undefeated bishop class champion. Her path into the fighting pits began a decade earlier when the arena owner acquired Lillia as an Edel Raid partner for another fighter. To shield Lillia, Rasati vowed to take her place. This forged a deal with the owner: Rasati would fight to earn freedom for both herself and Lillia, while also repaying her father's debts. Fighting solo without an Edel Raid partner, she demonstrated remarkable prowess, defeating opponents including trained Pledgers.

After defeating Coud Van Giruet and finally earning Lillia's freedom, the arena owner betrayed them, refusing release. Lillia responded by initiating a React with Rasati. This act not only secured their desperate escape but forged their bond as adoptive sisters.

Liberated, Rasati resurfaced later during the final assault against Chaos Choir. Aligned with the Edel Raid protection group Arc Aile, signaled by the symbol worn around her neck, she and Wolx Hound carved a path for Coud and his allies to rescue Ren from the organization's stronghold.

Following the conflict's end, Rasati adapted to life beyond combat. In a concluding moment, she tentatively tried on traditionally feminine clothing with Lillia, expressing discomfort and feeling the attire simply didn't suit her.