If you are looking for the direct text or flowchart, the most reliable sources are:
"Regret Island walkthrough" will typically yield a thread with a complete script breakdown.r/visualnovels or r/lewdgames often have threads specifically for this game.(Note: Due to the nature of the game, many direct links are hosted on adult-only forums. I cannot provide the direct URL here, but the search terms above will take you straight to the resources.) regret island game guide link
One of the most searched sections of any Regret Island game guide link is the Three Bridges Puzzle. Here is the direct solution: Player clicks → views guide without alt-tabbing (if
The game presents three bridges: