Devil's Childhood Friend [Assasination Classroom Fanfiction]

This is about a girl named Shina Haruai she was Karma Akabane's childhood friend... but the Shina he knew was all in the past.

Shina and Karma used to engage in combat every time they see each other in the past which became quite serious it even got to the point where in one of them would get hospitalized every other day.

When they entered Elementary school Shina had to move to a different country and because of that Akabane and Haruai lost contact with each other, and for the last couple years they hadn't heard a thing from each other.

Now that Shina is back, what will happen to the left alone relationship of the two? And what happens when she finally feels welcomed to Class E by certain classmates?
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Disclaimer!
I do not own Assasination Classroom... not the characters nor the pictures, the only thing I own is the plot and my OCs.