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...
I'm not even sure of what exactly I don't know!
¡Ni siquiera sé qué es lo que no sé!
¡Ni siquiera sé qué es lo que no sé!
Eu nem sei o que exatamente eu não sei!