Finding passwords for the english version is easy but the japanese version is impossible.... anyone can help?
Googling for ダウンタウン熱血物語 パスワード turned up a few passwords: http://goo.gl/54Ga8 (http://goo.gl/54Ga8)
The one from here: http://www.geocities.jp/markn5401/ku2.html#pass (http://www.geocities.jp/markn5401/ku2.html#pass) maxes out your stats and gives you stupid amounts of money:
(http://i.imgur.com/bmunh.png)