I think the word you're looking for is epilogue. Prologue is before the story, and epilogue is after the story
(A/N: Valentine here! If you don't know already, it looks like MHA is about to end! If you have seen the panels, what do you think of the ending? Warning: might be spoilers.)
I completely forgot about this story for half a year, found it in the middle of My library, and binged it from beginning Till now. Time to come back in another 6 months so i can binge it All over again