The OVA adaptation Hen Zemi is created by studio Xebec, based on TAGRO's "abnormal comedy" manga also known as Abnormal Physiology Seminar. In the story, Nanako Matsutaka has been assigned to the Abnormal Physiology Seminar, even though she herself is a rather ordinary person with no abnormalities in particular. On the other hand, her classmates, including the college upperclassman Komugi Musashi, have just about every abnormal condition to speak of. (based on ANN synopsis)