What's the difference between Happy NTS and Happy non-NTS?
Also the Sam thing is kind of difficult because the game prevents previous exchanges from opening up...
Happy non-NTS is just a path where you triggered Happy in the beginning, but rolled the normal dialogues and never asked Liz to do deprave acts (like wearing more revealing outfits, flirt other guys, post lewd pics, etc). It will only be a path of a typical girl (Liz) who loves her boyfriend (MC) but sometimes cheating with another (Matt).
***I said "sometimes cheating" in Happy as compared to NTR where she is cheating "all the time".
Also, someone told me before that running Happy path is useless without NTS.... Well, to answer that, there are pics that can only be unlocked in Happy nonNTS - Lewd, and Happy nonNTS - Conservative, respectively. (Don't ask me what those pics are. I already completed all 661 total pics for this latest version that I already forgotten which one, lol).
As for Sam, just agree on every chat she will attempt with you, especially the fortune-teller drawing. Then, at the end of 20.0, make sure you access the chatlog between Sam and Ishani. After that, the Ishani profile will be available in ShareSpace.
(I re-ran this Happy path so many times with different choices that it's now easy for me to make Sam happy or angry, lol).