From the introduction:
This game is literally just about punching and kicking the shit out of bad guys, and just generally being awesome. And now, so are you. Long ago, Long ago a great hero with awesome power, said to have the power of God in his fists fought the great SATAN Angra, a fallen angel attempting to destroy the world of humans using an army of demons and spectres. The hero sealed his ass into The Pit then bade a sacred order to watch over the arms he left to protect the world from Calamity. Then some douche bag broke his engagement and after some demon attacks, the two mighty weapons were lost. One went to the traitor Azel, calling himself Devil Hand. The other was with his fiancée, Olivia, destined to bestow it upon a cheeky drifter, Gene. And now, somehow you’re here to pick a side and play out what role you pick in the fight.