When Setsuka awakens in a white void with no memory of her past, she believes she has won a miracle: a world of her own creation. As centuries pass inside her fabricated reality, she slowly uncovers unsettling truths—she does not age, death is reversible, and the world obeys hidden rules tied to ancient devices and forbidden powers. Beyond her sanctuary lurks the Purple Cosmo, beings who seek to “redeem” life through control and brainwashing. To protect her world and the memories she was never meant to remember, Setsuka must face the truth behind her creation, her sister’s sacrifice, and the cost of fabricating happiness itself.