Najica Hiiragi, a skilled perfumer doubling as a covert operative, undertakes missions to retrieve renegade humaritts, androids designed for combat. Tasked with mentoring her humaritt partner, Lila, Najica not only trains Lila for the field but also forms a deep bond with her. With every mission they tackle, the veil lifts on the humaritts' enigmatic past and extraordinary abilities, unraveling a web of secrets and revelations.