thats the thing, Tatsumaki died in my route and when i choose her nothing happens.
In my experience there seems to be a sort of "relationship meter" and if you've clicked too many "wrong" dialog options you'll miss certain scenes regardless of routes chosen. This could not be the case but from I've seen you have to make sure the characters are "happy" to get certain scenes. In short, when you get option make a save and check them and gauge the reactions then make your dialog choices based on what the characters want to hear from the mc and how it might affect future events.