The release date for Ef-The latter tale is 20th December
Source:MangaGamer Staff Blog » Blog Archive » ef -the latter tale gets a Release Date! And Pre-Orders!
In order for the drm.bat to work you need to have the game where the program specifies it
In my case was C\Users\me\downloads\TickTack
After moving the game folder there it worked for me
Hope this helps