Its the fifth film of this old Japanese anime (animated) series and its an attempt at rebooting it to our more modern times. With that said its a no go as, wonderful as it is, it exists in a different formula of film making and, is therefore too dated for the 21st century approach to anime.
Its a tale of a protector and his team, as bodyguards/detectives, in a case that was meant to be an easy job...BUT! The rest is the usual formula of most detective style story's; solve clue's, find the answers and solve the case. The City Hunter series has its own style (like any other character in any type of story/film) and thus, it has to remain faithful to the recognized formula. Some of the complaints from people of this film are obviously not aware of formula's attached to film/series characters! You would not change anything about DC/Marvel heroes or they would not be the same people we love! Its a strong and well weaved written story plot that makes a series successful and, although this films story was okay it was too weak to make it great!
If you are not a fan of Japanese Anime you will not like this. If you are the modern generation type who only watches violent, blood & gore animated films etc...you will not like it either. I still think its worth a watch if you want to know what the anime style is like.