Spoilers

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So I went through the raws, I don’t know Japanese. I have a question, why did the black haired boy die? Like did he actually go onto the train tracks and the two boys talking was just made up in the light haired boys mind? But why did the black haired boy kill himself/die?

I think they both died? They show two empty desks.

There was chapter 7 where they went to the scene to find traces of his death and found a tooth.. it was only the black hair guy who committed suicide