Najica Hiiragi wraps up target practice and is summoned to her next mission with a single rose. There, she infiltrates a mansion to rescue a girl from a countess. Back at the city, Najica is a renowned perfumer at the CRI. She is summoned again by her boss and is hinted that she will have a new partner. At home, she discovers the girl that she rescued is in her room.

The mysterious girl is named Lila and she is to be Najica's new partner. Lila is a gynoid known as a Humaritt. Their first mission together is to stop the assassination of a judge's daughter at an amusement park.

In order to stop businessman Todd McCormick from selling a recently reactivated laser satellite which has been destroying things like military bases, Najica and Lila befriend McCormick as sisters but later infiltrate his aviation museum and must deal with their female guards. The mission is updated to include the recovery of a Humaritt.

Najica's next mission is to investigate a Japanese idol group called the 4C'zNs as one of its members is suspected of being a Humaritt. Lila pretends to be a new idol, and tries to scan the girls to see if they have the serial numbers indicative of a Humaritt. However, it proves difficult as the girls act the same, leading them to wonder if they might all be Humaritts. When the girls capture Lila, Najica rescues her but as they chase down the girls, they discover that they don't have the special markings and that their manager is the true Humaritt.

Najica and Lila are tasked to go after Ricardo Kidel who has purchased a nuclear missile in the black market with hopes of staging a coup in another country. The mission also involves recovering another Humaritt. Najica is attacked by a sniper named Koharu.. The girls board the ship and then a submarine which carries the missile. They capture Koharu, and blow up the sub, sending the missile to fly uselessly into the ocean.

Najica and Lila must recover an extremely strong combat Humaritt that does not have a master before an enemy militia does.

While Lila recovers from her injuries, Najica must recover a teenage math genius who is trying to escape from government agents.

Najica and Lila work as models for at a weapons aircraft event in order to look for a shady weapons dealer with a Humaritt named Tony. Their modeling takes publicity from a jealous company executive and his daughter. However, Tony later appears to steal that company's fighter plane, using the daughter as a hostage. Tony and Najica face each other in a dogfight, while Lila raids the dealer's ship.

Najica and Liia travel to a country run by a ruthless queen to recover a Humaritt from a rebel militia group led by the queen's daughter.

Ninja-like girls tack down a couple on a train trip through the forest and it is up to Najica to protect them before it is too late.

Najica must recover a young male Humaritt from another Humaritt named X.

The creator of the Humaritts comes forth and explain the reason she created them.