Basically half is bunch of doujinshi oneshots and half is the actual story. The actual story "starts" from: Togainu No Chi Vol.4 Ch.16-20 (I write "starts" cause it's not from the begining - it's a couple of chapers ahead.) + It's not even finished yet.
Guys which ch was when maya's father found out about their realtionship? ╮( ̄▽ ̄)╭
He first appears at the end of volume 6.
Thank you so much(⌒▽⌒)