Sadagiri Shinjou

The heroine. Taka-Akita Academy's Student Council secretary. Second Year. In charge of Team Leviathan's vanguard protection. Ex-St user. Having grown up in the mountains of Okutama her common sense is behind about 10 or 20 years.
Mysterious girl assigned to the Team Leviathan. Receives preferential treatment in UCAT Japan and those who know her true story are very few, like Ooshiro Kazuo. She has lost her memory, so she does not remember where she came from or her own parents, so she joins the Leviathan Road to find information about her past. However, the clues are very scarce as besides her name, she only has a men's ring in her right hand's middle finger and the memory of the Silent Night song.