Buy it if you want to support the artist: https://www.dlsite.com/home/work/=/product_id/RJ01013166.html
New pages start on page 166, though I've also never seen that last Touma one either but I could be wrong about that. Haven't been keeping up much with the dude but it seems he's working on the dogengers manga now, so I'm not sure how inclined he would be to make more books, though he always at least draws stuff on his lewd account.