[golthin]

Originally Posted by FTV

Spoiler for Yuuki:

I think it's pretty clear Yuuki is a hallucination, not a ghost. Yuuki keeps telling her she knows, Yuuki only appears to her, and even if he was a ghost she would at least be repressing the memories of his death. Also with a show geared towards realism, hallucination due to extreme trauma is much more acceptable than ghosts.

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Spoiler for yuuki:

if it was a hallucination, he wouldn't disappear when other people showed up. He stayed around when Mari was with mirai because Mari already knew he was dead. I am more inclined to believe he was a ghost than a hallucination. By the way, even though i have known that he was dead all the episode, i couldn't help feel my eyes get misty when he told mirai "I'm dead".