if you paid attention to this episode, you'll notice that Sakamoto is actually dying
-they let Sakamoto be the representative for the graduating students even though he's just a 1st year
-clearly him going to America was a lie, even his senpai noticed it
-he left the school cause his life wouldn't last long
-he hit his face with the pie because yeah.....he's crying
-if you search the english translation of the ED, it fits this ending

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that would make sense, now it hurts even more thanks