You won't find one - there are too many variables involved & paths crossing. The best thing I can recommend is to pick a path/girl(s) you want to pursue and look at how the character stats chance based on your decisions - and if you're that concerned look at the *.rpy game files.Where can the full walkthrough of these games be found?
Common themes you can keep following throughout, even if pursuing another girl are:
1. Stay friends with Rebecca and eventually decide which option to choose regarding her relationship with Boris.
2. Stay friends with Adele and eventually decide whether or not and how to help her in her relationship with Gary.
3. Improve relationships with or ignore Irene/Andrea/Kirtsen.
Often best to stay friends with and at least have a threesome with Luana/Yanmei - as your relationship stats otherwise plummet. You can opt to not have sex with Luana before that without her stats dropping.