There have lately been strange rumours in the provincial city of Mihana: witness reports of girls masturbating, and girls suddenly breathing heavily. As a guy, Sei would like to see it with his own eyes, but he dismissed it as a simple urban legend. However, one day after school, he saw a girl who looked like she was masturbating by rubbing her back against a locker. He didn’t realize it at that moment, but he could sense something strange from certain places and girls. He wasn’t the only one who had the same sensations, but also his osananajimi Minato, cool senpai Gekka and cheerful kouhai Hinami. It seems that these incidents were caused by ‘omokage’, which are like spirits which possess humans and affect their mind and body until their desires have been satiated, so they decided to form the anti-omokage club to combat them.