Finding ones place has been a theme of this series and is still a big
part of things. The early part of the series focused rather heavily on
Kohei for obvious reasons, but even here we're seeing how important the
cultural festival is for Erika since she very much wants to feel like a
normal student. Unlike the usual idea in that she's trying to avoid her
vampire heritage, here she's fully accepting and happy with it, but she
wants a normal high school experience as well. She's thrown herself
pretty hard into the whole role that the student council has to take on
for the event and really does seem to thrive and enjoy it, which in turn
is rather heartwarming for Kohei since he wants her to be happy.
Part of her reason for it is also the take her mind off of her mothers recent arrival and the push she's making for her to take on a servant. There's an interesting dialogue about how the world has changed and the old ways shouldn't apply, but mother always knows best and that Erika may have a thirst that cannot be sated solely by blood bags and the like. Luckily for her, she gets quite a distraction since summer is upon them and that means time at the beach, with lots of bikinis and characters that suddenly have larger chests than you normally think they do, (hello, Hina!) and basically a whole lot of upbeat goodness. Even with the tinges of something larger in there in the relationship between Erika and Kohei, it's all good summer fun stuff that comes across really well, like most of this series.