Milo hails from 2388, a time when humanity neared extinction from a pandemic. Naturally resistant to the Revisions—a hostile faction harvesting humans for survival—she serves as an agent for AHRV. This organization fights to preserve humanity's surviving future by battling the Revisions across timelines. Witnessing their massacre of AHRV members forged her deep hatred for the Revisions, shaping her into a strictly logical and emotionally reserved operative.

Her path intersects with protagonist Daisuke Dojima across multiple eras. In 2010, she intervened during Daisuke's childhood kidnapping, rescuing him and his friends. During this event, she prophesied Daisuke would protect his friends during a future catastrophe, though she failed to recognize him upon their reunion in 2388. This earlier incarnation displayed kindness and compassion, starkly contrasting her later detached demeanor. Records indicate this 2010 iteration sustained severe, potentially fatal injuries from a gunshot wound, though her ultimate fate remains unconfirmed.

Physically, Milo possesses long, straight pink hair parted to the side and pinkish-brown eyes. She typically wears a form-fitting mecha suit and carries advanced weaponry. In 2388, her role centers on guiding Shibuya's displaced populace, equipping them with "String Puppet" mecha to combat Revisions. She operates under AHRV directives to rectify the Revisions' temporal disruptions and restore Shibuya to its original timeline.

Personally, Milo maintains significant emotional distance, rarely volunteering private details. She eventually disclosed fragments of her past to Daisuke, including a tradition from her deceased sister involving a string puppet story and a symbolic good-luck kiss—a gesture she later replicated with him. While mission-focused, this act hinted at underlying emotional connections beneath her disciplined exterior. Her story concludes with her monitoring emerging spacetime anomalies in London after Shibuya's return to 2017, vigilant for unresolved threats.