A newly revealed Port Mafia member—Y/N, the chained daughter of the late Mafia Boss with the world-ending ability “Annihilation”—struggles with her tragic past, her secret connection to her twin sister in the Armed Detective Agency, and the lingering loyalty of her former lover, Osamu Dazai, who never truly left her behind.

The air in the containment chamber never changes. It is always the same recycled coolness, the same soft hum of the suppression system, the same dim glow of the artificial lights overhead. The chains around Y/n's wrists are warm against their skin—they've been worn long enough to carry body heat.

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