Tsurugi Yagami

As the eldest sibling of the Yagami sisters, this educator serves as a teacher at Sasami's high school. Although she possesses the mature responsibilities of an instructor, she maintains a youthful, petite appearance reminiscent of a young child. When she isn't busy managing her classroom duties, she can frequently be found relaxing in the faculty lounge, where she enjoys passing the time with various adult-oriented games.