Ozaki Nagisa (尾崎 渚) is a new character who appears in Tokihogushi-hen and is mentioned in ''Miotsukushi-hen. ''She was born in Ibaraki and was a childhood friend of Rena, and unfortunately, the girlfriend of one of the male classmates that Rena attacked in April 1982.

Nagisa is a girl around Rena's age. She has brown eyes and long, blue hair with bangs parted to the right. She wears a white shirt along with a short, check-partnered, dark green skirt and a coffee pink jacket. She wears black knee-socks and brown shoes. She also wears two hair ribbons on each side of her head, the same color as her jacket.

She helps Tomoe with her investigation involving Rena's case. Near the end of the Tokihogushi-hen, Nagisa found out about Tokyo's plan that she tried to warn Tomoe and Rena but was knocked unconscious and got kidnapped by someone. She woke up and escaped out of the car from her kidnapper, but was later run over by a truck during the process, leaving her kidnapper unidentified to Tomoe.