What you need:
How to install:
1 – Install the XClannad app on your Android device.
2 – Create a folder in the root of your internal sdcard and name it “clannad”.
3 – Install the Tomoyo After PC game to your computer.
4 – Go to the install directory, and transfer the BGM, DAT, G00, GAN, KOE, MOV, SYS and WAV folders, plus the GAMEEXE.INI file to the “clannad” folder on your Android device.
5 – Then transfer the modified SEEN.txt into the “clannad” folder.
And that’s it! Now you can enjoy Tomoyo After on your Android device.
Credits go to Crysis99 for making a compatible SEEN.txt for Tomoyo After: http://forums.fuwanovel.org/