The Manga DOES continue the story and it does get a bit better, but man those flashbacks are just painful..
Here is a recreation I made of the production of Episode 24 of Tenjou Tenge, around when they were halfway done the episode.
Exec: Well, are you just about done the final episode of Tenjou Tenge?
Head of STaff: Buh? Final? Isn't this an ongoing series..?
Exec: No... it's only 24 episodes...
Head of Staff: OH SHIT!
And thus we got the end of Tenjou Tenge. I was considering picking up this title at first but all the flashbacks and rushed ending really pushed me away, I've seen some rushed endings before, but this was horribly blatant.