I do think this was really beautiful -... but why wait until the extras to find out he's alive? I would have liked the main story to be longer and to explain how he finds out he's actually not gone? I mean I've read other manga where the ghost is actually more like an astral projection of someone in a coma, so I'm not surprised.. but this doesn't explain any of it.
How can people call the teacher predatory?.. All he said, eventually - was that he liked him, after being pursued by the student that he had genuine interest in helping in the beginning. The student kissed him - and the student even said "we are officially dating now that its graduation".. implying that the teacher was clear that they couldn't be together until then. I dunno, there's loads of student x teacher tropes on here when the teacher is straight up predatory from the first panel... this was nothing like that.
this was beautiful and intricate, though it almost feels like some of the chapters were in the wrong order? Or the flash backs were a bit messy.
it's a bit hard to follow, you've gotta pay attention to when they talk about being in highschool versus when they're getting lectures at college, etc.
Pages seemed shifted in chap 3 which made everyone confused about the flashback.