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So this is a Karmagisa story where Nagisa is obsessed with snakes, and wants to be one, his students can tell all to well, and after hearing the story of Nagisa's experience in class 3-E everyone found ways to get ahold of everyone that were inside the 3-E class to help transform the classroom to have detailed snake paintings on the wall, but Karma goes to the extreme and buys Nagisa a pet King Cobra and gets all of Nagisa's furniture to be snake related, paying over $100 Nagisa is very touched by this.
So as you can tell, this will be 7 years after the assassination, so enjoy!!!
Edit: don't pay attention to this, I completely change it in the story