Ruby's older sister. Dia is a force to be reckoned with. Not only is she super scary and tough, she somehow always has the evidence to prove you wrong. Like she has to prove you wrong, there is no other way. In the Aqours chapter, Dia serves as the Student Body President. Okay she may be weeb trash deep on the inside, but she never lets that show. Unless her annoying sister spills something... oh well that means she has to spend more time in the time out room.