how do I complete Lucy's Hint: Improve your relationship with the other members first, my main question is who do I go to to finish this?
You have to get every other available member to 5 first, then talk to her to end the prologue and advance the story. You'll be able to increase her to 5 after that and finally start dating her like she deserves.
you need to finish everyone to level 5 but only the people you have unlocked trust me its pain😢