Depending on which lover you chose, their previous version counter part will be in the timeline 0. 1,2,3 are for when you do something that Ryoko never expected.
Yeah ghosthunting may change a lot. I have few ideas but will see in future. I'm also removing a few of Masuo's animation to work finish these projects quickly. I know it's a few quests in Magic Ring are gonna be difficult to figure out but it's better not having hints about them so actual game can be in the development soon.