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Kei Kikuno is just an ordinary college student by day, but by night, she's the top hitwoman for a secret assassin dispatch service, known for her laid-back demeanor and deadly precision. Operating in the gritty underbelly of Tokyo, Kei takes on dangerous missions with a carefree attitude, navigating a world of violence, greed, and betrayal. Alongside her quirky allies, including her handler and fellow assassins, Kei faces off against ruthless foes while balancing her double life.