Megazone 23 (メガゾーン23, Megazōn Tsū Surī?) is a three-part original video animation created by Noboru Ishiguro and Shinji Aramaki.

The events take place in a post-apocalyptic future, where Tokyo only exists as a simulated reality. The story follows Shogo Yahagi, a delinquent motorcyclist whose possession of a government prototype bike leads him to discover the truth about the city.

Source: Wikipedia