In the 1800's, a mysterious comet hits the U.S. southwest, transforming the local cattle and animals into their own version of the old west called Moo Mesa, complete with several lawmen dealing with bizarre outlaws.
Hanjuku Hero: Aa, Sekai yo Hanjuku Nare...! is the second game in the series. The Egg Monsters featured in the game are parodies of Final Fantasy IV characters.
The game was re-released on the WonderSwan Color in 2002. This version features a graphical overhaul and twelve new summons.