Voice Range: Mid-High Pitch

Nanase is a middle school student that heard rumors of the Hollow Night and decided to investigate the claims with her friend, while having a slight misunderstanding of the context of what the Hollow Night actually involved. She accidentally runs into Hyde where the latter thought she was Hilda and ensuing commotion of their meeting caused a Void to bite Nanase. Hyde dispatches the void and saves Nanase's life and leaves her in the park after she regains consciousness. Since then, Nanase is strangely infuriated by her transformation into an in-birth and hunts Hyde with a notable passion that quickly earned her a reputation out in the night.

She has a tendency to jump to conclusions and doesn't consider alternate possibilities, such as the Void that bit her being the reason she's an In-Birth instead of Hyde (who in reality had saved her life) and, due to her lack of information, thinks that Hyde is also responsible for others' abilities. When distressed, she tends to have a poor choice of words when expressing it that result in double entendres, causing those around her to think she's talking about her sexual history.