Ep 3+4 were alot weaker than 1+2 imho.

Rokuro acted out of character when he begged for help. At least I thought of him more of a "I'll do it myself" type of guy that wouldn't bother other people to fight fights for him.
I'm not a fan of the arm either, I really hope it will turn out to be something similiar to Highschool DxD