What a big waste of time.
This 12 Volume long piece could have been easily been a 1 Volume piece since practically nothing at all is happening for the first 11 Volumes.

There is some character development present, but only for the side characters. The main character is basically the same pathetic person for pretty much the entire time.

The flow is like this:
others help him out -> he realizes he is weak and useless -> maybe wants to change -> doesn't do anything

*repeat for ~11 volumes*

I rarely have been this angry at a Manga on how slow and boring it is and how nothing is happening to build up any emotions toward the main character. He is a wimp and he stays a wimp for an incredible amount of pages.
In the end it wraps up exactly as anyone can imagine for this type of manga, except there was no real build up to anything. My suggestion is to maybe only read Volume 1 and 12, anything between is pretty much the main character sulking and being pathetic because he can't do anything at all and also does not do anything to change it.