Hibiki Mikimoto

Hibiki is the step-daughter of Rui and Hina’s biological father, Jou Mikimoto, making her Rui and Hina’s stepsister. She is portrayed as a young girl, appearing to be in Middle School, but to Natsuo’s surprise, is only one year younger than him. She was originally opposed to letting Rui Tachibana meet Jou Mikimoto, for fear of her father reconciling with his old family and hurting her mother’s feelings. However, she eventually agreed that Rui could train under her father as a chef.