At this school, there is an ancient tradition requiring new teachers to undergo a ritual in which students strangle them and cause them to collapse. Following this tradition, the rookie teacher named Mariko must receive this initiation from two students, Tugumi and Koharu. The choking is performed in various positions and methods—face-to-face, from behind, with four hands, and even using a jump rope—presenting a wide range of intense techniques. Throughout the process, Mariko's veins bulge, her eyes roll back, and she is pushed to the brink of unconsciousness. This grueling experience serves as a crucial first step in her journey as a new teacher.