It gets to lean more into seriousness more often in more recent volumes, but the core doesn't really change so much as it comes out to play less and less.
This one, .
Given the ongoing nature of the LN series and the fact that it hasn't reached the end of the calendar year of their first high-school year (to say nothing of how far the manga lags behind even that), we don't know who he'll wind up with (ignoring the impact of being title girl), so...
Author really builds a strong case for each main girl as the series progresses. I've been Team ever since she became a major character and we . Mirei fans have this and plenty more to lean on, though.
You'll likely get the first crumbs in around 5-6 chapters, if not too much content is skipped from the source. There's a lot of monologue/dialogue-heavy stuff to get through first, though.