What do you do when a murderous villain ends up unconscious at your front door? For Yuri, the answer is simple: leave his body outside protagonist Anne-Marie's house and then live in peace as a background character! But for some reason, Yuri can't bring herself to let him ruin sweet, innocent Anne-Marie's life as is written in the original story, so she takes him in and slowly nurses him back to health. Little does Yuri realize the consequences of letting a villain inside her house...