Hints: Darker Doki

Getting started:
First, read through the story like in a normal Choose Your Own Adventure book. There should be some information you can pick up along the way.
Next Steps:
Group the colored letters based on their colors, and order them by the order in which they would be seen in a “Choose Your Own Adventure” path.
Stuck after first cluephrase:
Think about what “unreachable content” might be, and double-check what paths you took through the book.
Stuck on final cluephrase:
Look carefully through the puzzle for something that could be considered extraneous content.