Koyomi Yoimachi

Sharing a dormitory with Michiru, this cheerful human girl hides a complex, dual nature. While her primary persona is sweet and innocent, she possesses a second personality known as "Yomi." Triggered by Michiru’s voice or a kiss, Yomi is an uninhibited alter ego who harbors intense feelings for Michiru while possessing the supernatural "Dead Man's Tongue" ability. Though Yomi is focused solely on Michiru, the otherwise bubbly Koyomi maintains a subtle crush on Sotetsu Asō.