"...In Marebito, ...Tsukamoto plays Masuoka, an amateur videographer who
becomes obsessed with peoples fear and capturing it on video...
video camera in hand, Masuoka begins his journey into the subterranean
regions of Tokyo.
While traveling through the creepy tunnels and
pathways, Masuoka learns of DEROs, or, Detrimental Robots, that roam the
underground and feed on the blood of the living..."