The Death Note is a magical notebook which grants its wielder the ability to kill anyone, so long as the writer knows the person's name and face. The instructions on how to use the Death Note are included on the back page.
Sarah is a political activist who has been fighting an oppressive regime for the last decade. She used to be a high-level competitive debater who won multiple major tournaments when she attended university.
One day, Sarah stumbles onto the Death Note while running away from a protest where many of her fellow activists were fired upon, leading to several injuries and a few deaths. When she picks it up, a demon named Ryuk appears informing her that the Death Note originally belonged to him but offers her the option to either keep the Death Note or give it back.