is there an order to follow?
Sounds like you don't have the Trial Vers. so to answer the question: Yes, for the most part.
From 1 to 24 is in straight storyline order, but those after are a different story.
After the 24th event, you'll be able to watch 1 out of 3 events in whatever order you wants, because each of the three routes follows a different girl.
Kinda like how you go to one route but then stop at midpoint in order to play another route, putting the former on halt.
The girls corruption route starts at 27 (Arika), 28 (Rietta) and 29 (Terena), but you don't have to follow the event numbers from here.
Arika's route in order would be 27,30,33 and 35.
Rietta's route is 28 (plus a side event that happens after 28), 31, 34 and 37.
Terena's is 29, 32, 39 and 43.
The numbers are on the videos, btw.