The president of the Gehenna Academy's Disciplinary Committee who visited the seaside for a training camp.
Fundamentally someone who doesn't like to put in a lot of effort, she reluctantly visited the beach for training. Both her swimsuit and rubber ring are ones she had when she was younger, having hardly ever played at the beach. Hina attempts to explain this by saying "it'd be a waste if I didn't use them", but deep down she is a little conscious of the fact that her old school swimsuit still fits. Regardless, no matter her appearance, and despite it being summer and being at the beach, her strictness when it comes to public morals doesn't change.