Erito Kaihatsu Senior High School is an a elite development school which produces remarkable students every year around, students around the globe study at Erito Kaihatsu due to their high-percentage employment and graduation rate. The school classes are split into 5 groups, these groups are determined by your intellect, physical and socialism, in midterm exam individuals or classes are able to move up or down a group due to a person ability increasing or change of progress on work. These class' names are labeled as A,B,C,D and E, A is labeled the highest class in the school and where many of the noticeable students in the class are viewed to be the country's future leaders and following to the opposite end is E the lowest class there is in school and where the majority of the students there barely got the skills to get accepted in, It has low-employment and graduation rate than any other class.