Fate cruelly causes an ordinary office worker to be reincarnated as a Demon King in another world. Yet ironically, a technical error during the resurrection leaves behind a vicious curse. This curse relentlessly gnaws at your soul from within. It is silent, but it can defeat you at any moment.
Now, you must embark on a perilous journey to find a way to break the seal. The curse gradually erodes the sanity of a Demon King. Day by day, you may sink into unnecessary indulgence. At times, the curse will even control you to act on such urges. Rummy Master keeps you on your toes at all times. But are you certain that those things will truly bring you pleasure?
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