Correct me if I’m wrong, but despite being mutual friends of Lisa, being in the same school, same year and a (twin) sister in Roselia, Hina and Yukina have never had any proper interactions, have they? How would that turn out if it were to happen..?

Makes you think how many of these characters haven’t interacted with each other. I can’t think of any right now, but I’m sure there’s plenty of pairings ready to be explored.