There is an urban legend that tells about kids disappearing in a strange abandoned city, the protagonist is there to search for his sister while other children have their own reasons to venture into that desolated place reminiscent of the Midgar slums from Final Fantasy VII, such as proving they are not afraid or simply exploring.
The children all wear fox masks as part of their game so we don't get to see their expressions as they explore the city and unravel the mystery behind the disappearance of several children rumored to have been spirited away.
The art is a mix between the computer flash style animation and classic animation. It gives a nice balance to fit most preferences. Since this movie is so short, just under half an hour, there's no time to develop the characters too deeply, but the main focus is the mystery.
I'll only say that the Matrix comes to mind, but this isn't about being in a virtual world so it's not exactly like the Matrix. Watch it yourself to see what I mean. There are also hints of mythology mixed into the eerie environment for an entertaining result.
