Hi! We’ll probably do an ending guide after everyone has done resting, but for now here’s the gist of it:
Every encounter with the shadow monster has 3 sequence of choices, and only when getting all of them right you’re considered to “perfectly win” that encounter (there’s an auditory cue for the right and wrong answer).
The requirement for the good ending is perfectly winning all three encounters.
The requirement for the true ending is winning all three encounters plus getting at least two answers perfectly right on Ame-Onna battle.
The Ame-Onna battle is different because each sequence has 4 options instead of 3, and there are 2 wrong options and 2 right options. One of the right options give you the extra points needed for the True End. If you win the battle but fail to reach True End, you will still get the Good End as long as you did perfect on the previous three shadow battles.