Talk:Heroes/@comment-94.133.20.21-20170620120457/@comment-30003996-20170728092619

The webmanga of ONE clearly state in the Garou and MA act that at first there are only A, B and C class which are classified using primarily feats and hero public image that the associate identified. At the time, A class, B class, C class only differences are in how well their image to public and the Hero Association received. High rank heroes at that time still drop like old leaves. A bunch of today S class heroes are C and B class due to they are not really after the credit thingy or not really have time to stay and take the credit since they have other living matter to attend.

Thus, even the associate at the time can not know which hero is actually strong and which is weak. When really strong monster show up, the heroes they dispatch usually can't fight the monster because those heroes only have good image but no combat skill. To avoid this situation, S class is created to incorporate those who are really powerful into the rank and when emergency situation like MA incident happen they know who to call.

https://www.youtube.com/watch?v=2sLXEEF0BoU&t=240s