In Finland's route, if you go to the party, there is the option to get into a fight.
I was invited to the party but how you got there?😂 I end up having the bad ending lol
OK. Basically, just follow Finland around all the time. Flirt with him when you can, and all that stuff lol. When you get invited to the party keep hanging out with him and you should be able to go to the party.
oh, I encounter that xD but suddenly when I thought it could sail, I got the sad ending LOL