The office lady who hates to lose, Yui Mitsuru has a secret hobby... Which is to read hentai manga about sadist perverts with huge cocks! One day, she notices that her number one rival from her year, Arizumi Touma, resembles a manga character and ends up masturbating while thinking about him. However, her secret hobby is then revealed by chance...!? He licks her ears and presses his hard cock against her... "So you're in that kind of mood?" It's her first time, and she hates him, so why is her body tingling like this..?