So, Akira doesn't mind "selling" herself to an obviously in love with her guy (luckily Yuu isn't some kind of perv and settled with head pats) just to have a glimpse of her unrequited love picture...
She gives away yandare vibes but that's not a typical yandare, otherwise nobody would even glance in her way other than Kai.
Reason for Kai to break up with Akira was her being overprotective and clingy, thought she threatened him or something, that's honestly not as problematic. Wonder why she crave attention so much, that's not normal at all, she needs some serious help it seems...
Thanks for the scanlation!