Whilst going about her usual business, Dasha, a carefree teenager from Odessa, witnesses her younger brother throwing himself off of a high-rise apartment building. After looking into the recordings of his phone, she discovers that he took part of an online challenge known as "I'm Playing", which was thought to be an urban legend and was founded by a shady and mysterious organization unknown to the general public. Not realizing the full scope of the danger, Dasha starts an investigation of her own, putting the life of everyone she knows at risk.