Hav never been a fan of certain Japanese films due to their weird gore n story. Havent read any of their manga. As for the Gantz, without having any exposure to its video game, manga, anime n action films, i was pleasantly surprised n happy to see this movie on a dvd. Imagine the fun on big screen. In one word, Gantz:O is an impressive visual spectacle. The movie is filled with style, awesome action sequences n terrific monster designs. The monsters were good. The editing is top notch n thankfully the hand held cam stuff n quick cut editing is nada n most of the action happens in proper light so you can actually follow what is going on. The characters appeared realistic with their facial expressions n body language. After watching this movie, i have become a fan of the Gantz series n looking forward to its sequels. They hav included one weird scene, a weird old man transforms into a naked woman n then into multiple naked women... after all its a Jap movie.

Mysterious monsters have been attacking in Japan; they are being fought against by equally mysterious people armed with futuristic weapons wearing skin-tight black suits. One day student Masaru Kato is killed trying to protect somebody from a knife attack on the Tokyo underground. He is shocked when he awakens in a room in a high-rise building overlooking the city; there are others present and a strange black sphere. He learns that the sphere, for unknown reasons is known as Gantz and those present have all died and being dispatched to fight monsters by Gantz. They are given a set time and earn points for their contribution. Before he has learnt much more they are teleported to Osaka where they must confront hordes of monsters. As he fights alongside the others of the Tokyo Team, and a girl from the Osaka team, he learns more about the rules of the game and the possibility of returning to his old life... just surviving the game will be a challenge though.

I haven't read the manga but enjoyed the anime series some time ago so thought this should be worth a watch... it is. At first I was a little unsure about the CGI; the characters look so real they risk entering uncanny valley territory. Thankfully it wasn't long before I forgot all about that and got into the story. The plot is fairly basic; once the action moves to Osaka it is almost non-stop monster fighting action. This is done in a way that helps the viewer get to know the key characters, in particular Kato and his desire to help others. The action is pretty intense and quite violent at times; as those familiar with Gantz should expect. The CGI is really impressive; much of what we see looks real. I don't think it is essential to have previous experience of Gantz but it is likely to help a bit as not everything is explained. Overall I'd recommend this to previous fans and anybody who likes intense monster fighting action.

These comments are based on watching the film in Japanese with English subtitles.

I haven't read the Manga, but I have seen the TV show and the two real live action movies. So I'm aware of the concept of the movie. But if you haven't any idea what this is about, you get thrown into the water and you might be confused at first. But it's a great thing to do. I personally think, the really crazy and action packed beginning works very nicely for everyone.

But don't worry, after the introduction (if you can call it that),we get the real introduction where things get explained a bit. The animation is really good and the violence level (as in how explicit it is shown) is very high. There's also some nudity, but in a very horrific kind of way. The pace is frantic and the demon world is mixed up with the real world ... with some ambiguous results ...