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Download the user manual here.
Some events don't have branching choices.
Instead, they are there for you to be able to adjust the link gauge and the affection meter.
There is one point at the end of each generation where you can drastically change both.
This event involves all three heroines.
It's possible to raise the affection of a heroine to its highest point here, so long as their affection level is high enough before this event.
If you aren't worried about how your decision will affect the heroines' affection, you can easily adjust the link gauge here as well.
This event with the heroines is the save point mentioned earlier where you can collect events.
If you save at this point, you will be able to go back and choose a different heroine. Remember that the record of those events will only be reflected in the save data, so you'll only be able to view them.
Gallery images can be collected through various means, so it is recommended that you save at each event point.