As you said, very standard setting.
The art isn't that appealing.
But at least there's good flow/rythm and feels nice.
So I might keep watching that one.

Other things:
He's so bad he can't even excel in being bad and finished 2nd last. But since he was able to kick all those students asses, my guess is that there's a flaw in the rank system. Flaw being that his true power can't be measured by that ranking system for a reason they'll tell us later.
I wonder who's the very last. I wonder if that person will have meaning in the story.
For some reason, I seemed to me like they really insisted on those details, so why not...

Regarding that vengeance and the flashback, could it be Yaya is modeled after Raishin's murdered sister? Girlfriend?