The notoriously sadistic and domineering student council president, Maina, finds her world turned upside down when a shy male student gets his hands on the 'M Note'. This powerful notebook has the ability to rewrite her very personality, transforming the proud sadist into a desperately obedient masochist. The series follows her complete and total corruption as the notebook's entries force her into increasingly humiliating and lewd situations. Initially resisting, Maina's mind and body are broken down, awakening a deep-seated craving for degradation. She is compelled to perform explicit acts, from offering her body in the student council room to being subjected to public groping and eventually craving intense group sex scenarios. Every new command written in the M Note pushes her further into depravity, erasing her former self and replacing it with a cum-addicted slut who finds her only pleasure in being used and utterly dominated.