@Siranjeevi
Chapter raws are released split into three parts. Each part comes out bi-weekly(every other Sunday). Looks like the translators prefer to release whole chapters usually, so you have to wait a month and a half for each chapter to be released, and then wait for them to be translated.
It's probably one of those cases where the author was told vol 2 was the last volume, but then the publisher last minute realizes it's selling well now and it wants more. So now, despite the author rushing the ending, they now have to figure out how to continue the story.
Happens with TV shows too.
I was thinking "Maybe the mangaka is over worked" which would explain the long delays, I could understand this then. But nope, as far as publicly available info is concerned, I can't find any evidence he's working on other things, at least in the novel/manga industry.
What is interesting is...