In current ep1-4 you dont have any such point of choosing yet ^^
And in future updates, while not yet 100% so don't quote me on it, idea is to "lose" one by one girl by choices/denying them/relationship points throughout regular play. Maybe if you manage to have multiple even through all that I could make a screen where you choose. But yea, first option I mentioned is my way I'm aiming for.
Ehhhhhhhhhhh I meaaaaan kiiiiinda? 😅
The "death flags" are easy to spot. As in "girl tries to kiss you and you say no" styles of flags. The other part, having enough relationship points is another topic, but so far I've been very generous with them and there isn't stuff that's locked behind "need 100% of all points" or anything similar. As long as you start focusing that girl more and more in later updates, you're fine.