Far and away the most interesting character in my book. In a world like this one, the women who don't turn out like Seira do seem like the oddballs, at least if they really do consider it important that they "get a man".
Sure, her standards got too high due to her taking care of herself--but even then, that's not...really a problem? If you have confidence in your person and apply yourself to achieve things, I feel it's reasonable to not want to "settle" for someone beneath your ability.
Unfortunately for Seira, her world leaves her starved for choice as it is. Add to that her growing panic and then treatment at the hands of a douchebag like that guy, and her defeatist attitude makes sense to me, along with her obsessive nature once Masato finally showed up in her life. Not condoning the potential abduction and whatnot, but...well, I can see where she's coming from based on what we've been shown.
Sucks for Masato that he decided to overcorrect in the wake of getting pushed down a few chapters ago, though. I'm sure he'll continue suffering from success as this goes on.