Ren and Rio, passionate cosplay fans, find themselves transported to another world where their outfits are more than just costumes: they define their fate. Forced to live as servant NPCs in a grand mansion governed by strict rules and overseen by mysterious instructors, they must navigate a reality where any deviation from their roles could mean losing their memories and humanity. Haunted by the ever-watchful presence of players from beyond their world, Ren and Rio struggle to maintain their freedom, their bond, and their sense of self in this perilous new adventure where love, survival, and mystery are tightly intertwined.