How many chapters are you thinking about the game/story having?
I'm not really sure what you mean by "common route" and "individual route".
MC and Angelica are the two core main characters, you can't really have a story without them, so I can't see how there could be chapters without Angelica in them.
OOooohhh, by "common route" and "individual route" you mean the "common route" is because there wasn't any real player decisions, so all players are on the one "common" path, but in chapters going forward, we'll be able to make decisions so not all of us are going to playing the same way so we'll all have "individual" routes? Our decisions changing the story.
That's awesome.