The series is about a girl named Momo who attends high school at the city of Sorasaki. However, she is secretly a member of Tsukikage, an intelligence agency that protects people. As a new member of the agency, she works alongside her colleagues including her senior Yuki and friends. Together, they work to establish peace in the city.

• Yukari Anzai
• Akane Fujita
• Manami Numakura
• Aya Suzaki
• Mikako Komatsu
• Yuri Noguchi
• Aya Uchida
• Shizuka Itoh