@phoenixir
Yeah, it feels like these middle part are "fillers" or "fan service". However, I can get why JP people were into it back then 'cause when there's fan service, they all dig it. But now that mangas has grown so much that we've experienced these kinda fan service/stories to find it not as interesting as these days when people keep coming up with new themes, ideas, stories.
Hmm... Vol. 13 has 13 chapters and Vol. 12 ends on Ch 131. I'm doing my best to get to the end 'cause, I'm pretty sure most of us can guess what's going to happen xD
-tucks herself in bed- goodnight and I'll see you guys... tomorrow!