Manami operates as one of two teenage employees at the S&A Detective Agency in Rags Town. She boasts a boisterous, energetic personality, frequently providing comic relief. Her appearance features unkempt orange hair that underscores her lively, chaotic presence.

She partners closely with Ayaka, the agency's reserved computer specialist. Manami acts as the dominant, proactive half of this duo, often dragging Ayaka into situations; their dynamic earns them the collective nicknames "Ayamana" or "ManAya". Manami shows initiative but acts impulsively without considering consequences, driven by a desire to prove herself beyond minor cases like finding lost pets.

Her impulsiveness directly influences the plot when she volunteers the agency for a high-stakes job involving mysterious cargo, despite the leader's absence. This decision leads to the discovery of Sara, a genetically engineered human weapon designated HW-9. During the confrontation with armed pursuers, Manami freezes under gunfire, revealing her initial vulnerability. She later names the amnesiac woman "Sara" after the town Massara, symbolizing freedom.

While specific past details remain undisclosed, context suggests she arrived in Rags Town to escape or forget prior circumstances, adhering to the district's rule against personal inquiries. Across the series, her character develops, gradually becoming more proactive and reliable within missions, especially those protecting Sara. She shifts from seeking validation to actively contributing to agency objectives, though her core energetic and occasionally reckless traits persist. Her role remains integral to the team's operations.