Miyu has medium length orange hair, two upward pigtails tied with pink ribbons, and dark brown eyes. She wears the female Kisaragi uniform.
Miyu is very good in sports and is popular among both girls and boys at her school. She has a crush on Satoshi Mochida, and often suggestively teases him, although she later insists these are only jokes. She also is really kind towards Yuka Mochida.
Miyu and Yuka are separated from the rest of the group when they are whisked away to Heavenly Host. They take refuge in the infirmary, but Miyu becomes the group's first victim when her ankle is snipped by an unseen assailant hiding under the bed. She dies trying to defend Yuka from some snake-like creatures, in which she is decapitated.
After Satoshi and Naomi find Yuka in the infirmary, with the latter holding Miyu's head, Miyu's spirit appears and tries to confess her love to Satoshi, but the latter can't hear her.
Miyu's spirit later reappears in front of Satoshi and Yuka after the latter used the piano and summoned the school's trapped spirit. She leads Satoshi to Naomi Nakashima, although the latter is just an illusion from Sachiko Shinozaki. She makes her last appearance as the group attempts to escape the school and helps Sachiko contain the vengeful spirits pursuing her friends.
- Despite sharing the same last name, there is no known connection between this character and Seiko Shinohara. Neither ever appear in the same medium.
- Aside from this, Miyu and Seiko share drastic similar affection to another same-sex main character of the series. However, the only difference is Seiko displays more physical affection to Naomi and whereas; Miyu shows more emotion of her feelings towards Satoshi.
- Miyu is likely a nod to Seiko's character as the former appears only in the manga based on CORPSE-PARTY in which the latter didn't appear.
- Satoshi and Miyu became closer after she was being picked on by a group of other students, in which she hides herself away in the gym equipment room to be alone. Satoshi runs in and asks what they said to her, also adding before that he was worried about her. She tears up, throwing her arms around him as he stumbles back, clearly flustered with her actions.
- Miyu is the only known character in the manga series to be Transgender/Gender non-conforming.