Erina is a teenager with medium-length blonde hair swept into one pigtail on the right side of her head by a scrunchie with brown eyes. She wears the Satsukiyama Academy school uniform consisting of a brown double-breasted jacket, a white sailor shirt with a black trim, and black skirt with knee-length black socks and black loafers.
Erina is good friends with Yuma Okita and Miyako Hayakawa, and the three are usually seen tagging together in flashbacks. Erina has a one-sided crush on Yuuma Shindou. According to Yuma, she is kind to her friends. However, she and her group has been bullying Tamaki Minase out of jealousy due to Tamaki's relationship with Yuuma.
She with her friends were the ones to summon Saki Akagiri and then send her to Tamaki.