The anime that broke your heart?

Assassination Classroom is such a good anime. I binge-watched the 2 seasons in a few days, but that ending. That ending was like a big uppercut in the face. I cried for at least 20 minutes straight. I really recommend watching it, even though I wouldn't want to watch it again myself because of how emotional it got me. Just hearing "Bye-Bye Yesterday", the last opening of the anime, i can feel the tears coming back.