Theory about Yuri in season 3 of School Spirits (shared from reddit)
Reddit - The heart of the internet
All of the characters were holding their keys when they died, but I noticed that they're also all linked to the *way* they died - all except Yuri, which I will get to.
Maddie's necklace: she tore off her necklace when Sanda 'killed' her spirit
Wally's football: he broke his neck playing football
Charley's letter: he drowned his sorrows in french fries after writing the letter, causing anaphylaxis.
Rhonda's letter: she was killed showing her acceptance letter to her guidance councilor
Quinn's field marker: she was killed in a bus crash on the way back from a marching band competition
Mr Martins watch: he was watching the time on his watch when the fire started
And then we have Yuri, who's key is his lighter (the show made sure we noticed it by focusing on him picking it up). Yuri claims to have died from an asthma attack caused by a panic attack in the greenhouse - nothing at all to do with his lighter.
We know Yuri smokes, and we know he's done a lot of medical research so he must've known how risky smoking was for asthma. He has also been very passive when talking about death, telling the others he doesn't believe in moving on and that he's content where he is now.
I think Yuri triggered his asthma attack on purpose in hopes to escape his anxiety. If he was smoking in the greenhouse when he died then it would make sense for his lighter to be his key. It would also make sense for him to lie to the others about his cause of death, as they didn't want to die.
