Kyoto native who shares familial ties with Yoshino's half cousin. This individual cherishes both Yoshino and her grandfather due to their striking resemblance. Aside from being close friends, she also possesses a character similar to Kirishima - kind-hearted yet known for having romantic relationships with multiple individuals.
Her mother is the claimed daughter of Yoshino Somei's grandfather and his mistress. In the manga, Yoshino and Kirishima visited her in Yokohama where
Her mother is the claimed daughter of Yoshino Someis grandfather and his mistress. In the manga, Yoshino and Kirishima visited her in Yokohama where she plans to attend university. During the visit, Kirishima confirms that Tsubaki has connections in the medical field and is the one who helped with Yoshinos attempt to sell her kidney. However, instead of taking out Yoshinos kidney, Tsubaki took her blood.