Momo Minamoto is a high school girl in the city of Sorasaki. Interrupting her everyday life, the private intelligence agency "Tsukikage" scouts her to join their ranks.
Tsukikage belongs to no man or country, and fights for justice and peace from the shadows.
Consisting of only young women trained in mind and body and equipped with special tools and ability enhancers, they are in conflict with the criminal organization known as "Mouryou" currently spreading its influence in the city.
Momo, under the tutelage of her seniors, finds herself participating in these battles to defend her friends and family.
The spyce must flow when Momo unknowingly observes Tsukikage on a mission. What will this mean for her confidence and desire to become a police officer?
It’s one thing to WANT to join a secret intelligence organization, but a completely different matter to pass initiation! Good luck, Momo, you’re gonna need it!
All Momo wants is Yuki's approval, but her mistakes nearly botch Tsukikage's missions! Is she really cut out for this role or will experience come with time?
As an apprentice, Fu owes a lot to Tsukikage, especially to Mei. How far is Fu willing push herself and what can Mei do about it?
Momo's dedication to the cause negatively impacts her personal life. Meanwhile, the Moryo organization establishes a new affiliate to lure Tsukikage out into the open.
Humanity can be cruel. Two friends were torn apart and forced down divergent paths. One joined Tsukikage, and the other joined Moryo. What happens when they reunite?
Theresia continues her investigation into Hatsume’s ties to Tsukikage. Hatsume attempts to rekindle her old friendship with the Moryo agent but where will this leave Goe?
Tsukikage travels to Okinawa and discovers that their contact, The Shisa, have been wiped out by the Nirai Kanai. Meanwhile, Goe bonds with a girl claiming to be a Viking.
All members of Tsukikage had mentors at some point. Yuki tells Momo the story of her own mentor, a girl known as Nagaho. Whatever happened to her?
All things must end, and that includes Moryo's reign of terror. The countdown begins while Tsukikage has a heart-to-heart. They prepare to take down Moryo once and for all.
It was a trap! With the traitor revealed and Tsukikage decimated, Moryo's ambitions now stand unopposed. However, it is always the darkest before the dawn...
Project Gekkako is now up and running. With only a few remaining members of Tsukikage left, will they be able to save everyone or fail as others before them?