I have two questions
1. Okay, I met with the Ryuugu Komachi Unit in both Week 10 and Week 21 and both of those weeks had a decision. What are those Decisions all about?
2. I made it to the top 50 around week 25 and afterwards I get a scene where you meet Ritsuko in the office. Afterwards you get a decision. What is that decision all about? It is not there in the Guide.
lemme try to answer each one of them(I hope I'm not wrong

)
1. CMIIW, but AFAIK those "decisions" on the weeks where u meet ryugu komachi on a fest doesn't have any particular known effect as of now(based on the guide I read)
2. when u say guide, which guide do you refer to?
there's a portion of it in the guide, named akizuki ritsuko under the "idol specific communication", it gives you the correct choices for a certain week and as for the weeks that aren't included, it is said that it doesn't matter what u choose
assuming you're following the previously given choices which will get u to a certain level of ritsuko's impression then u don't really have to choose the correct answer for the unlisted choices. u will unlock a trophy related to her afterwards if u do this successfully
======unrelated to the question======
how do you beat vesperia fest?
a lv.5 heart appeal doesn't seem to guarantee victory, any amulets that I can use to abuse these lv.5 heart appeals?