User blog comment:B214/Season 3 confirmed!!!!!!/@comment-24412159-20141210130341/@comment-16281343-20141211082447

What differs Issei to the typical harem MCs is that there's a reason why he can't do things and Ishibumi was able to handle and explain it in a reasonable way.

He didn't just say that "he has a trauma. That's why he can't do shit so deal with it". He listed things that Issei wasn't able to do and reason why he wasn't to. "*I don’t want a filthy low-class Devil like you talking to me.
 * ……..At times, I wonder if it’s okay for me to talk to everyone here who is a bishoujo.
 * Ahahaha! Yeah, you are right! It was a very royal date! Thanks to it, I was very bored!
 * …….When I go shopping with Buchou and the others, I start to wonder if they are actually bored by being with me.
 * I don’t want a rotten brat like you calling my name!
 * …….I also want to call Buchou by her name……
 * Ise-kun! Please save me! This Devil is trying to kill me! I love you! I love you so much! That’s why, let’s defeat this Devil together!
 * …….My first girlfriend begged for her life to me……..and the woman I love, killed that woman."

That part of Volume 10 is one of my favorites.