Using the supernatural power of the M-Note, Souta transforms the sadistic Student Council President, Maina, into his devoted masochistic slave. Although Maina initially attempts to maintain her haughty attitude, she quickly succumbs to Souta's commands and finds intense pleasure in her new role. The situation becomes further complicated when Shino, the president's assistant, reveals that she is also Souta's slave, sparking a competitive rivalry between the two women for their master's affection.