RoomMate (2013)

After an accident, Harumi Hagiwara finds herself in the hospital, where she connects with her nurse, Reiko Nishimura. Once discharged, they choose to live together, but things take a dark turn as Harumi begins to experience unsettling occurrences alongside Reiko's increasingly odd behavior. Her unease deepens when Reiko starts calling herself 'Mari,' suggesting a complete transformation in her identity. As the chilling events unfold, Harumi realizes she may be in danger, and the situation escalates into a shocking murder investigation.