Blue Seed is a story about high school girl named Momiji Fujimiya. One day she was walking home from high school and she runs into a man that goes by the name Mamoru Kusanagi. He was given the power of the seven Mitamas to protect the Kushinada, who happens to be Momiji Fujimiya. From their she joins government group called the TAC. Momiji, Kushinada and the TAC all fight the Aragami in order to save Japan.