From Nagisas Point of View.

Back to Zero:

We did it. We killed Koro- Sensei... but I can't feel any sort of victory or similiar. I and the rest assassinated him one minute before midnight. Before the Lance of the Heavens could fire another shot. Full of sorrow and fatigue we went into our classroom.

Years passed and Okuda mixed an antidote for Koro- Sensei, that could destroy even the 1% of earth destruction and mostly revert him back to his old form, out of accident but we were fully aware that it was useless now. Okuda gave me the antidote so I could watch over it for us all.

I went to bed early and fell asleep, the antidote resting on the desk beside my bed. I dreamed of Class E's time with Koro-Sensei, of everything that happened. Of how we tried to assassinate him and of how we had a war in our class because some of us wanted to save him and others to still kill him. Of this all and the rest. /I want to go back... I want to change everything/ Is what I thought every single time I went to bed.

I wake up, feeling very light. I sit up, open my eyes and... panic, this isn't my room. It's my room from the time where I was still a child.

„Nagisa? Are you up?" I hear my mother call.

„Y- Yes!" I reply

I'm confused about what's happening and look into the mirror. I draw back upon seeing my reflection, I look like back when I was a child. /A dream,... this must be some sort of dream! There's no way this is real!/ I desperatly try to think of something that could explain this beside being in a dream when my mother enters the room.

„Breakfast is ready, come on, let's eat" She says and I comply.