So, I wouldn't call this a walkthrough, as many of these may be out of order. Maybe more of a choice guide. When you come across choices in the game, look them up here to see what they do. Some of these are obvious what they will do. I've left out even more obvious ones, like letting Chris get Ann's number.
Anyway, if you want to know how to reach a specific question, I can probably figure it out. Just ask. If you come across something that's not in here, but think it should be, let me know.
Updated to version: 0.8 Alpha
Here's the link to the old PDF walkthrough up to v0.5 by Qleaf:
https://f95zone.to/threads/long-story-short-v0-8a-ttrickgames.31351/post-3457917