The story focuses on Keita, a high school student living on his own, lost his mother in his youth. One night at a ramen stand, he meets a mysterious girl named Kuro. Keita is told the story of how if a person runs into another that looks just like them, they would die. From Kuro, Keita learns of the Doppeliner System and the Coexistence Equilibrium and how his life would never be that same afterward.

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