A group of vigilantes has been formed to keep an eye on the neighbourhood. One of them, a lady, gets killed. You play the part of her brother, whom never even thought of his little sis killing a fly, nevertheless combating a gang of thugs using hi-tec gunample speedsters. You can save and load in between missions, just in case you die or something stupid like that. Then you have the Melee option, split into three parts.
Videos are thorough.
The opening sequence depicts your sister's death. The videos in between missions slowly unfold the rest of the story, some of her friend, her enemies, her qualities, her faults. A mission can have as many as four videos each. An opening one, roughly telling you what to do, or providing a bit of info about your sister, one or two middle videos, usually when there's more than part to a mission, such as a sudden break in just a mile from your location. And then you have your concluding video, showing the end of a mission, what results from it, or what you find.