It tells the story of Ailee Marie Mondano who is being possessed by a demon. This demon wants to take over her body for good due to her weak nature. She was bullied and dragged into the woods where no one could witness their evil desire to hurt her. The bullies, Katie, Michelle, and Rita, beat her until they triggered the beast inside her. As a result, the beast avenged Ailee and got them hospitalized. The beast protects her. The beast rescues her and delivers her from harm. But the beast wants more. The beast doesn't only want to show up when Ailee's in danger. The beast wanted to cast Ailee away and take her body. Can Ailee fight the beast inside her?