Here's a guide how to get Green and Blue star (I still don't know if it's possible to get all 3 at same time (White star nor did I get it), and I have been trying to fit everything into one playthrough =_=):
- Night 1: Fix them in order (leave Roxy out), Buy Hairpin for Seraphina
- Night 2: Consult -> Can't walk away -> Say something cheerful, Seraphina
- Night 3: "BOOP DAT SNOOT!" (oops wrong version XD), Aurora, Aurora, Aurora (AI), Chi
- Night 4: Chi, Roxy, Go find Seraphina, Chi -> Explain to her, Seraphina (CobaltBahamut is the 1st password)
- Night 5: Bring what Chi's AI told you, Roxy, Mia, Aurora (AI) -> Make a Bridge, Chi, Mia
- Night 6: Start transfer -> Chi (AI), Aurora, Aurora, "FUN"
- Night 7: Tell Seraphina, Seraphina (TomNovember is 2nd password), Mia, Mia
- Night 8: Roxy (AI), Aurora (AI)
- Night 9: Aurora, Aurora (AI) -> Run the program
- Night 10: Roxy -> Tell her -> Shut it down, Roxy (AI)
- Night 11: Mia (AI), Mia, Seraphina
- Night 12: Start transfer -> Mia (AI), Seraphina, Seraphina
- Night 13: Seraphina, Chose anyone
- Night 14: True Ending
Problem is that I wish for Mia to get earlier to transfer but Aurora gets berserk around Night 10, and Chi around Night 8 (I forgot what night) and you don't get true ending if you transfer Roxy AI to HDD, but you have to Talk to AI -> Roxy (like steps above) and then go for Roxy (AI) "before night 10 (or 11)" since Lexy will leave and can't help you anymore, and you will die from AI attack if you attempt to do it. I don't think that berserk for both Mia and Roxy will activate at all (maybe Roxy at 13, 14 night), but I did transfer for Mia till 13th (since it requires 48h, aka 2 days) and still got true ending.
Hint: Mia doesn't need to be transfered, just do all dialog options with her (first prioritize others) and on 13th she will come with solution.