I don't think Harima should end up alone, but if you ask me, Eri would be better for him than Tenma. I mean, hasn't the poor guy suffered enough with that idiot?? Besides, Eri is way better looking and they make a better couple.

Poor Harima he loved Tenma to death and she had to run to Karasama he is not even cute if you ask me he is very scary looking somebody

The series has ended its run in Japan, and many were left unsolved. MY guess is that either he'll be with Eri and marry her as promised... or, stay with Yakumo while Tenma is in the U.S.

But that's another story for another time. For now, we'll never know.

I think in the manga School Rumble Z Harima ended up with Eri since I saw a part Eri and Harima with their/a baby.