Some people will probably remember this game as being called "Crash 'n Boys Street Challange," with altered sprites and backgrounds. This video is of its original Japanese release, "Bikkuri! Nekketsu Shin Kiroku! Harukanaru Kin Medal."
Of all characters, this run uses THE worst one: Hayami. His life metre is at mere 140 (255 being the maximum); and his strength/speed/defence average is among the lowest.
So he's weak, slow, and fragile.
Until the 'tool' is used to turn him into a superman.
With instant save-loads and slow-downs, he becomes the character that dominates all five challanges in the game. He plays tough and dirty; and doesn't shy away from absolutely humiliating his competitions every chance he gets.