This article is from the Final-Fantasy and other Square Soft Games FAQ, by firstname.lastname@example.org (Nick Zitzmann) with numerous contributions by others.
Hanjyuku Hero was a "simulation game" produced by Square around the time
of FF V (FF5), for the SFC. There was a predecessor on the Famicom, but
I have no information about it. The game contains lots of Japanese puns,
and was not translated to any foreign language.
The player, "hanjyuku hero," was the leader of an Arumamuun nation. But
over a long period of peace, he becomes sloppy, so the nation is on the
verge of destruction. Just then, the "kanjyuku army" invades, and the
player is to fight a war against them.
The game is a simple real-time simulation, where the objective in each
stage is to capture all the castles on the map, then defeat the stage
boss. Each unit consists of a leader and a bunch of nameless soldiers.
The characteristic of this game is the "egg monsters": some leaders (on
either side) are equipped with an "egg," which allows them to summon an
egg monster in battle. However, that which monster would appear is
random, and the power of the egg monster varies greatly, though in most
cases it would have no problem squashing enemy human troops.
The story is a comedy, with a hero who is kind of sloppy. The highlight
is on the egg monsters, many of whom are parodies or puns of FFIV (FF4)
characters and objects.