A series of QTE fights. Follow the prompts using the arrow keys and the spacebar for finishers. Only four opponents... then again you have to beat them all twice to see everything so that counts as eight. There's also a secret hard mode but don't bother, it'd just piss you right the fuck off.
As for the story line... I'll let you use your imagination for now. I'm sure I'll have thought of something by part 2.