The story revolves around Akari, a beautiful and skilled young woman in the art of weaponry and ammunition, who is involved in an undercover criminal gang operation in Tokyo. She is recognized as a prominent member of the "Nitro Shadows" gang. However, Akari carries a hidden desire to help others and do what is right.

One day, Akari crosses paths with Rio, a young and powerful detective who is determined to bring about change and fight corruption in the city. Rio is amazed by Akari's abilities and presents her with an idea to change her life's path.

After much contemplation, Akari decides to break away from the gang and join forces with Rio. They join a new team and utilize their skills and experiences to fight crime in Tokyo. At each stage, Akari and Rio face numerous challenges. The former members of the "Nitro Shadows" gang, now recognized as enemies, try to stop them. With their unique abilities, Akari and Rio overcome all obstacles and gradually infiltrate the gang's ranks.