What if the way to save Koro Sensei was to kill him? What if, if he was killed by a skilled assassin, then would he be able to... live on? My name is Nagisa Shiota. I was a normal guy- well, as normal as you get if you've killed your teacher- until, 5 years later, I touched the knife again for the first time since it had been used. The same knife that I stabbed him through the heart with. Now I'm hearing my dead mentor in my head, not to mention the tentacles that just decide to pop out of my hair whenever they see fit! Am I going crazy?! Whatever happens, I've got to keep it a secret from my flatmate (and crush!) Karma Akabane. *Sigh* This is going to be hell... What could possibly go wrong?