The monster of 1st grade, class A. summary: Class 1-A at an all-girls high school presents a challenge for Tarou Jimi, their newly assigned homeroom teacher. Despite its surface appearance of pretty and talented young women on the verge of adulthood, the class is notorious for driving teachers to resignation due to their subtle bullying and shameless blackmailing. Momo Hananaka, a model and leader of the group, is particularly skilled at leveraging her charm and influence to intimidate and manipulate the grown-ups in charge. However, Jimi is not as easy to rattle as they might have assumed. Beneath his unassuming exterior lies a dark history that may make him a match for the "monsters" of 1-A.