To me, the relationship in this series is a lot like the triangle in Macross Frontier. To get the most out of it, I'd argue that focusing on the characters themselves - their upbringing, their personalities, the circumstances they find themselves in - is far more useful than trying to put it through a 'romantic' filter.
Working!! character descriptions:
height complex...and dense - probably as dense as Yachiyo. (vol. 2 makes this very obvious). But it's not just a height complex, is it? (She actually wants people to treat her as an adult.)
Besides her androphobia, she has a complex about her flat chest.
Kyoko complex...and incredibly dense.
Manipulative like Souma (but even more innocent about it), but clumsy as hell (dojikko)
Easy to read (her thoughts and feelings appear on her face)
Normal...except that he likes Yachiyo...and is actually へたれ (in terms of love, anyway).
Owner of the best straight face in the restaurant.
Likes manipulating people. Doesn't want to be manipulated himself.
Has insane information gathering skills (v3 - he even knows who Yamada really is...?)
minicon. Coupled with a huge aversion of tall people (anyone who looks over 12).
Nevertheless, has a great sense of responsibility and loads of tolerance.
Wallpaper. or Air. Also very bad at distinguishing between people?
eats and eats and eats.
Is never surprised by anything.
Er...easily able to wrap older people around her little finger. Usually without bad intentions. (And it's not just to help her brother, as her first meeting with Poplar in the manga proves)
A drunk who keeps changing boyfriends.
A romance author...who barely has enough strength to stand up, and cannot keep herself tidy.
A divorced lawyer who uses her law books as weapons, both figuratively and literally.