User blog comment:Halo1081/Chapter 128 and forward/@comment-4911196-20150302030909/@comment-4911196-20150302031840

Judging by Kayano's statement, she wants a revenge by killing Koro-Sensei so i believe she have a vengeance against Koro-Sensei. The only person who knows outside Class E and Ministry was Gakuho Asano.

The mystery is within Ministry of defense itself who seems try to cover the actual birth of Koro-Sensei. If does then it could be a global uproar because once Ministy of Defense realize the information was exposed it will be too late for them to stop it and the other countries start stop helping Ministry of Defense.