Batman and the Justice League

I don't know why this manga is still marked as ongoing, there's four volumes (23 chapters in total) and that's all.
STORY: 7
Rui Amamiya, a young Japanese boy who went to Gotham to investigate an incidente happened one year before where his parents supposedly died, finds himself in the middle of a fight between the Justice League (Batman, Superman, Wonder Woman, Aquaman, Green Lantern, Flash and Cyborg) and the Injustice League (Joker, Lex Luthor, Ares, Orm, Sinestro, Anti-Flash and Cybog Superman) for the control of the Lay Lines, power lines that run throughout the entire planet and hold the key to the creation of a new world.
ART: 8
The artstyle is very clean and neat, with all characters easily recognizable and the action scenes (that make up the 75-80% of the story) easy to follow. Then again, this comes from the same mangaka of "Saint Seiya Lost Canvas" and I personally like her style a lot.
CHARACTER: 7
I'm not an expert of the DC Universe so I don't know if the heroes and villains' characters were in line with the original comics, the only one I know a bit more about is Batman and I think he's quite on character. As for Rui, the only external element, he doesn't have much of a presence even if he plays a crucial part in the conflict, he starts acting actively only around the later part of the third volume and even then he does more damage than help (I won't say more to avoid spoilers).
ENJOYMENT: 7
The story is a bit predictable, but the numerous action scenes keep the interest high and every hero has a chance to shine. Sadly, I found the ending a bit rushed, had there been a fifth volume, or even two more chapters, they could've at least handled Rui's inner conflict properly instead of solving it in such a superficial way.