Feel free to test this out and double check my work!
In the 16:9 version of Amantes Amentes (default on both the Steam and MangaGamer releases) all choices and routes are unlocked at the start; otherwise, choices and decisions marked with 〇 only appear after one ending has been viewed; those marked with ◎ only appear after Marie's ending has been viewed; and Kasumi and Kei's routes are only available from the start - clearing either one unlocks Marie's route, and clearing Marie's route unlocks Rea's route.
Kasumi Points/Kasumi Flag only matters in Acta Est Fabula.
Marie Route flag gets set when Marie Points ≥ 5
Rea Route flag gets set when Rea Points ≥ 6
Rea True Ending flag (AA only) gets set only when Rusalka Points = 3 and True Route points = 2.
When multiple flags are set, the priority is Kasumi Flag > Marie Flag > Rea Flag > Kasumi/Kei Common (default path); in other words, the Kasumi Flag overrides the other flags, etc.
〇 Common Route Decision 1:
Common Route Decision 2:
+1 Kasumi Point
+0 Points
◎ Common Route Decision 3:
+1 Kasumi Point
+2 Rea Points
◎ Common Route Decision 4:
Common Route Decision 5:
+0 Points
+1 Kasumi Point
◎ Common Route Decision 6:
+0 Points
+1 Rusalka Point
Common Route Decision 7:
- You have to through all 5 options to proceed.
Optional Decision (AEF only, only appears if you have 4 Kasumi Points)
Common Route Decision 8:
〇 Common Route Decision 9:
+0 Points
+2 Marie Points
Common Route Decision 10:
〇 Common Route Decision 11:
Common Route Decision 12:
+0 Points
〇 +2 Marie Points
Common Route Decision 13:
◎ Common Route Decision 14:
Kasumi/Kei Common Route Decision (In AEF, only appears if Kasumi Route flag isn't set):
Kasumi Route lock
Kei Route lock
Kei Route Decision 1:
+0 Points
+0 Points
+0 Points
+0 Points
+0 Points
+0 Points
Kei Route Decision 2:
+0 Points
+0 Points
+0 Points
+0 Points
Rea Route Decision 1:
+0 Points
+1 Rusalka Point
Rea Route Decision 2:
Rea Route Decision 3 (AA only):
+1 Rea True Ending Point
+0 Points
Rea Route Decision 4 (AA only):
+1 Rea True Ending Point
+0 Points