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Twenty-two-year-old Mai Yashiro lives an unremarkable life as an office worker until a mysterious video game console arrives in her mailbox, dragging her into a deadly struggle for survival. The device forces her to play a sinister game called "Nightmare," where the stakes extend far beyond the screen. Refusing to participate guarantees the death of her loved ones, while losing battles within the game results in catastrophic physical consequences, causing limbs to paralyze or senses like speech to vanish entirely. As the sheer terror of "Nightmare" rapidly engulfs society, Mai’s employer takes drastic action by establishing a dedicated strategy team to combat the threat. Thrust into this specialized unit, Mai joins forces with a group of dependable comrades who refuse to surrender to despair. Together, they boldly rise up against the hellish mechanics of the game, fighting not only for their own bodies but for the lives of everyone they hold dear. This manga is adapted from a massively popular web novel that captivated audiences worldwide, amassing over forty million views online.