Ushio Kofune

Ushio is the deuteragonist of the series. She is the daughter of Alan, sister of Mio, and adoptive sister of Shinpei.

Ushio holds feelings for her childhood friend, and adoptive brother, Shinpei.

In the original timeline, Ushio was strangled to death when she tried to save Shiori from Shiori's shadow, together with Ushio's own shadow.
(Source: MANGA Plus)