Amanda leads the resistance against the Divine Emperor's oppression in Dela Grante. She is the younger sister of Illia, the knight who aided Takuya Arima upon his arrival. After Illia’s death and her cell’s destruction, Amanda survives alone, burdened by guilt and failure. She initially blames Takuya for her sister’s demise but forges a reluctant alliance with him when both are imprisoned in a psychite mining quarry.

During captivity, Amanda exploits a prisoner riot to orchestrate a diversion, enabling their joint escape with other inmates—demonstrating tactical resourcefulness. After reaching safety, Takuya reveals Illia’s death, triggering Amanda’s emotional collapse amid grief and shattered resistance hopes. This vulnerability leads to an intimate moment with Takuya, reflecting her need for solace. Subsequently, she shifts devotion from the rebellion to Takuya, adopting an affectionate, wifely role and embracing Yu-no as her "daughter."

In the Imperial City, Amanda resumes resistance operations, coordinating rebels to assault the emperor’s castle. Her commitment persists despite learning the Divine Emperor is Ayumi Arima, Takuya’s stepmother. Amanda joins the final confrontation to prevent Dela Grante’s collision with Earth. Though the ritual fails and catastrophe unfolds, she survives. Her arc concludes with the revelation that Kanna Hatano is her daughter from an alternate timeline, cementing an enduring familial bond.