In a world where both wearing and not wearing pants can coexist simultaneously, nothing is certain until observed. The unremarkable chemistry teacher Nakata, with his rigid and unfriendly demeanor, was disliked by the female students. However, a peculiar female student approached him with great interest. As he was seduced by her, he began to experience emotions he had never felt before... The relationship between teacher and student, advisor and club member, man and woman, male and female, me and her—is it appropriate or inappropriate? Even as they kiss and intertwine tongues, nothing is certain. Nothing is certain.