After years away from the classroom, former science instructor Ryuudouji receives a recruitment letter from a prestigious Tokyo academy and cautiously decides to accept. Upon arrival he is surprised to find the director is Sayaka Ryosaki, a colleague from his earlier career. She outlines a discreet program focused on the personal development of carefully chosen students, leaving Ryuudouji to weigh the professional opportunity against his lingering doubts. As the first day unfolds, past ties and new responsibilities begin to take shape.