Originally Posted by
Gjallarhorn
That's because all three, at the time they were produced, were based on on-going manga. The GetBackers manga has since ended, and the anime covered different sections of it, but there was no end to cover at the time it was produced.
Air Gear is still on-going as a manga, but the anime only covered about 130 chapters, and significantly changed a lot of what happened in the series.
Tenjou Tenge is still incomplete, and Oh!Great hasn't said if he'll ever get back to working on it (he's now working on AirGear).
Those three anime series served more as money-makers than story tellers than most do. When an anime is going to be made, it's script is drafted and it is signed for a specified number of episodes (for the most part. some series go on as long as they need to provided whatever they are based on is both on-going and popular enough...Naruto, Bleach, One Piece). Some on-going series, which are certainly popular enough to get an anime, but not so much as to continue indefinitely, still get signed for a certain number of episodes, and they'll stick to the story for the most part, and then have a made-up ending. They get good ratings when broadcast, sell DVDs and merchandise, etc. They also bring wider popularity to the manga, thereby increasing readers of whatever magazine it's published in, or buys of the light-novel or game, etc. And that's what it's about for some of these series such as AirGear, or Tenjou Tenge.
Bookmarks