This is a pretty nice music video by x0o0x_ or Wakame (ワカメ). Most of their songs don't have names so they can be hard to find but they're all on Youtube! This music video uses a mix between 2D and 3D with unsettling imagery. It tells the story of a girl attempting the "One-Man Hide and Seek" - which is basically a creepypasta ritual for contacting the dead. I quote from the creepypasta fandom; "Spirits, which are wandering restless on the Earth, are always looking for bodies to possess. In this ritual, you will summon such a spirit, by offering it a doll instead of a humanbody."