Due to her plain appearance, mako, a big-breasted girl, lacks opportunities for sex and is always indulging in perverted fantasies. Her personality is as timid as her looks, making her shy and hesitant. Her job is also mundane; she works at a library and has only had one sexual experience with a man… Despite this, she constantly harbors the desire to be treated roughly by men. She accidentally discovers the existence of a 'perverted circle' on social media. She decides to expose her previously plain fetish and document her lewd transformation.
