Kanna, a former honor student turned rebellious "kogal," continues to clash with her perverted teacher, Ren, who exploits her defiance through sexual coercion. However, the dynamic takes a shocking turn when Kanna discovers that Ren is the man her single mother intends to marry. As Ren infiltrates her home and manipulates both Kanna and her mother, the boundaries between teacher, student, and family blur into a web of lust and submission.