[Machine Translation] Nagai Kafu is the author of "Amerika Monogatari", "Furansu Monogatari", " ( ) Bokuto Kitan", and other works, and is also known as an unusually erotic literary figure. From the late Meiji period to the early Taisho period, Nagai was a professor of literature at Keio University, where he taught younger students and founded the university's journal, Mita Bungaku (Mita Literature). He was also an excellent educator who introduced his students, including Mantaro Kubota, Takitaro Mizukami, Haruo Sato, and Daigaku Horiguchi, to the world of literature through his publications. However, Nagai Kafu, a professor at the university, has never been properly illuminated. This book is the first comprehensive review of Nagai Kafu, a literary scholar of "sex" and "rebellion," and his achievements and influence on Keio University and the Japanese literary world as an educator.