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Since there're no major branch points during the second generation, you can proceed with the story while keeping an eye on the link gauge and affection levels.
Here are some hints for each of the heroines. These are based on the idea that you followed our hints ealier so they might not aply to everybody.
First, be kind to Yayoi. As long as you "take the high road" in a sense, she will most likely start to like you more.
During the first private event with Yayoi, it might be best to select an option that makes Ladius seem nonchalant.
In the event where Yayoi is going to tell Ladius's fortune, you might want to select an option that is pleasing to all involved, rather than focusing on Yayoi. (Of course you don't HAVE to follow these hints.)
Sherufanir is very open with her emotions, so try to pick options that will make her happy.
She tends to change her affection along with other heroines so it may be important to look to others first and allow Sherufanir to gain affection as you go.
The real brain-burner is Valeria. Your best bet is to be as "Ladius" as possible and allow this devious heroine work with other heroines to gain affection.
Ladius is the kind of guy who is just clueless about women. It might be better to take an option that is firm but off-topic.
Obviously, if you are in an event that will only affect Valeria then just make selections that will increase her affection the most.
The critical point where all of the Special Events occur is after a third heroine has joined the party. The first of these events occurs in a forest...
The two main points are to not take too much time and to not be to radical on the link gauge.