When i first saw the image of Kobato surrounded by classmates and Maria with a sadface i thought that Kobato was being bullied, when i read that she is actually popular i pulled a
HUH!, i mean yeah she's cute but the way she always acts it made more sense that she would be bullied. I'm guessing she doesn't like it when people flock to her and that's why she dislikes Sena so much (she is like her classmates on overdrive).