•TBHK theories•

1. Tsukasa-Hanako relationship

   ❗️Be warned, there is a lot of spoilers❗️
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         One of my personal favorites is the theory about Tsukasa-Hanako relationship

      The theory goes like this. At a young age Hanako was neglected and so he made an imaginary "friend", which you probably guessed is Tsukasa. But the relationship isn't as "simple" as that, Tsukasa is the "other" side/ side's of Amane (Hanako) that he tries to hide out of guilt . And the reason Tsukasa is so spoiled is because only this side gets "that treatment".
        And the reason Amane killed Tsukasa is because he wanted to "get rid of it/ him/ them". To back my theory up is because all the flashbacks in the anime and manga never really showed Tsukasa other than Amane and Tsuchigomori. I don't have a idea about Hanako's death yet but my hypothesis is that it's most likely, ❗️'TW'❗️ Suicid3.