Nakasugi Sayaka

Sayaka had a weak body until she was involved in a car accident. After she healed from the accident, her demeanor became more cheerful. [spoiler]It is later revealed that the reason for her miracle recover was because the Ryunka was inside of her. Once the Ryunka is awoken and taken off of her she loses her memories of what happened these last three months and turns back to her former status.[/spoiler]