Jin Sagami

As part of the ES operations department, Jin acts as supporting staff for the idols. Though he tends to find things troublesome and dumps them on others, he's attentive to his juniors and has a serious side to him.

In addition to being a teacher at Yumenosaki Academy, he doubles as a sports doctor who monitors the students' physical health. Once a super idol, he also offers advice as an alumnus of the school.

(Source: The English Ensemble Stars Wiki)