Can anyone tell me what the movie is about?

Basically the movie is a summary of everything happened in assassination classroom during their third year of junior high with koro sensei. The summary is narrated by Karma and Nagisa. It is a really good movie. You will have a rollercoaster ride down the memory lane of 365 days with Karma and Nagisa. The movie will make you laugh and cry at the same time as you remember the good times before the final bell rang.

"I hope you can kill me by your graduation"
~Koro sensei and Nagisa Shiota