Momo Minamoto, a timid 16-year-old second-year at Sorasaki High, channels grief over her police-officer father’s death into a fierce resolve to safeguard her city. Her extraordinary sensory gifts—hyperacute vision, smell, and the rare ability to taste physical and emotional states—catch the attention of Tsukikage, a covert agency battling the Moryo syndicate.

Once buoyed by her neighborhood’s warmth and her own cheerful nature, Momo’s life fractures after her father’s accident. Determined to honor his legacy, she apprentices under Tsukikage’s stern leader, Yuki Hanzōmon, whose relentless training hones her into a confident swordfighter, culminating in her decisive victory over Moryo’s ruthless head, Kurara Tendō.

Momo’s bond with Yuki anchors her growth, blending reverence and emotional reliance. Flushed cheeks, eager requests for validation, and impulsive hugs betray her deep attachment—a dynamic shattered when Yuki retires, her memories erased. Forced to lead Tsukikage, Momo mentors a new recruit, echoing Yuki’s teachings while grappling with lingering need for her approval.

Her toolkit includes Spyce, a spice-derived compound granting bursts of superhuman agility, paired with sensory prowess that unmask impostors or track foes. Though initially awkward, she learns to navigate teamwork and leadership, yet insecurities linger beneath her polished exterior.

Pale pink hair and golden-brown eyes—shifting to vivid yellow during Spyce surges—frame her 157 cm frame, marking her as Tsukikage’s second-shortest member. Her heritage as a protector’s daughter and reputation for kindness persist, even as missions with allies like Mei Yachiyo and Fū Sagami challenge her ethics and resilience.

The narrative closes with Momo stepping into mentorship, her journey from grief-stricken novice to self-reliant leader embodying Tsukikage’s enduring cycle of sacrifice and renewal.