Recently dumped by his fiancée, Mamiya meets a girl on a dating app. However, when he comes out of the shower, the girl is dead on his bed. Upset Mamiya decides to bury the body in the woods, however it mysteriously disappears from his car trunk... When he finds out that she is a popular influencer of the SNS called “Mimi”, he follows her footsteps which she left on Mimi, and slowly becomes attracted to the girl who turns out to be just as lonely as he is.

M, a mystery writer, has a girlfriend of five years named F, who disappeared on Halloween night. When a woman comes and claims to be her sister, M begins the search for his girlfriend. Along the way, the people he meets describe a woman very unlike the F he knew.