Jun Nagase, idealistic and upbeat, is assigned as a new student teacher for the class taught by Yuri Nikaidō. Jun, at first bewildered that everyone is indifferent to Keima playing video games during class, believes that he is a problem child, after all the other teachers explain their issues with him. She leaves with fear after trying to talk to him about it, but a spirit later enters her body when she had the resolve to help him open up. When Keima and Elsie learn about this, Keima finds his next target difficult since he is aware that a teacher cannot easily fall in love with a student unless they eventually see each other as equals. As Keima leaves the campus to figure out his plan, Jun catches sight of him, thinking he is ditching school. After dragging him to have lunch with her, she offers him to talk to her about his assumed problems. However, Keima does not like this unprecedented event since it will take too long for him to capture her heart.