I know that mangadownload.net has it, but I can't get anything good out of ed2k, because emule is always giving me a low ID even though I tried everything from forwarding ports to disabling firewalls. So, the only and best way for me to get these files is through direct download or bittorrent. Unfortunately, bittorrent has very few seeders on this manga on these specific volumes and that this site has only gone up to chapter 86.
From what I know, vol 12 & 13 goes from chapter 87 to 103.
Uploading these to Stoptazmo or finding a good link to download these volumes would be most welcome.