Outsider.
In a world called Mythosia, everything exists in unnatural monochrome beneath a false sky, split between divine purity, divine darkness, and the neutral Ink Town where both forces overlap. Humanity lives under the silent balance of two godlike beings, Sora and Hades, while Guardians maintain order by hunting creatures called Kuromono and mastering inner spirits known as Mimitsu, which are born from fear, desire, and trauma.
When Aijin, a university student from the real world, is suddenly pulled into Mythosia through a mysterious gate, she becomes an outsider in every sense of the word. She finds herself in a world already quietly cracking beneath its surface, where truth is unstable and people wear roles like armor. She is taken in by Nemeia, a seemingly laid-back but deeply unpredictable girl whose life is entangled with powerful families, fractured loyalties, and buried sins.
As Aijin tries to understand this strange world and find a way home, she slowly becomes entangled in the lives of the Shiwaki siblings, the political structure of the Guardians, and the mysterious cult-like faction Akasakino. At the center of it all is Nemeia, a girl rumored to be the “Great Sinner” of Mythosia, whose past includes betrayal, execution, resurrection, and a prison that erases guilt but not consequences.