Jun is doing her best to meet the expectations of the students.  She's very popular with the students, but she's been possessed by a loose soul.  And so, Keima begins his conquest of Jun.  However, she's preoccupied with becoming the ideal teacher, so she only sees Keima as a student.  In order to break free of the teacher-student mold, Keima decides to approach Nikaido, who was Jun's senior in school...
And there's nothing unusual about 
a problem child causing problems.
Y no tiene nada de raro que un 
chico problemático cause problemas.
Y no tiene nada de raro que un 
chico problemático cause problemas.
E não tem nada de anormal em uma
 criança causando problemas.