Mizuki

Mizuki-chan was Misaku Yui's former girlfriend, before she decided to dump Yui for another guy. Even though Mizuki appears friendly and outgoing on the outside, she is actually shallow and coy on the inside. This is shown when she asks Tae to quit her job as Yui's assistant because she wants to get back together with her and Tae is just in the way. She is kind of selfish too, because she wants everything to go her way.