Combat Academy A rank system is in place, ranging from SS, S, A, B, C, D, to E in descending order. SS-rank: A genius talent appearing once in a century. S-rank: Appears about once every ten years. A-rank: The highest level an ordinary person can reach through effort. B-rank: Someone who puts in a bit more effort than average. C-rank: Average. D-rank: Weaker than average. E-rank: The absolute bottom. There are tournaments for exams and such.