There is a fact unknown to most people in the world known as the Doppeliner System. It controls the destinies of every person living in this world by splitting the amount of luck or life energy called "Tera" of an individual between three identical beings. Of these three, the one who possess the most amount of Tera is called the Root and the two others with less are called the Sub. Should these people ever meet, the one with the lesser amount of Tera would die and the Root would absorb their Tera. When only the Root remains alive, they become a Master Root and gain an enormous amount of luck and lead a life with success at every turn. The Doppeliner System maintains what is known as the "Coexistence Equilibrium" and is overseen by a powerful race of beings called the Tera Guardians. This is a tale of battle that began with the meeting between a human boy named Keita and a young Tera Guardian girl named Kuro...
Having formed a ritualistic bond between human and Tera Guardian known as a Pact, Kuro saved Keita's life and attained new powers. But the bond carried a price that neither Kuro nor Keita was truly aware. Through new comrades formed in battle, Keita learns that his mother might have been involved with Tera Guardians before her untimely death. With mysteries to be answered, Kuro and Keita head to Okinawa to find answers.
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