As per the title, i went through the guide someone posted and even checked the comments on it since it was the exact same issue i was having. Yet despite having done the suggestion, I'm still getting the "do you want to go in" options instead of new ones. Any know why this is happening? please help. i really want to see the rest of Itsuki's endings

Ah. Finally figured it out. For those in the future who end up like me:

when deciding where to go for your date, make a save then pick karaoke. after reading some up until before Itsuki attempts asking about Lemure's Blue, go back to that save, load it and then pick the park. And from there continue along with the achievements guide.