Hey so for the past while I've been rereading the toilet bound hanako kun manga thanks to the anime release. And in doing so I've came up with a few theories regarding Tsukasa, (spoiler alert ahead for anyone who doesnt read the manga) these are all just based on my own speculation so please dont take it as the whole truth.
My theory will revolve around why tsukasa seems so obsessed with his brother, yet also so dead set on making his brother feel inferior.
I have a theory that since they were both from the 1960's, Tsukasa could of had some form of skitsophrena or some other disorder that was unable to be diagnosed.
That his whole attitude and personality was to much for others, as Amane said at the festival, his brother gets violent when you try to stop him from doing something. And this is still only when they are in elementary school
And perhaps the reason why Tsukasa is so attached to Amane is because Amane is the only family he has, perhaps their parents arent around, as they have never been mentioned and because of the school photos not showing them
Oh course this could all mean nothing and parents could still be around, but it would also explain why Tsukasa is so clingy with Amane and seems to want to do everything his older brother does, which includes dressing like him at their meeting on the roof top, to in the dreamworld joining the astronomy club simply because Amane did
He may not want to lose the only family he has, but it is also very possibly that he has always been jealous of his older brother,seeing as Amane seems to be the more level headed of the two and the more academically smart considering he was suppose to become a teacher if he didnt die.
Maybe that's why he wanted to push Amane to hurt him, because he wanted Amane to feel what it's like to lose control and he wanted to see Amane regret something.
I personally believe the bruises and cuts Amane has are from his brother Tsukasa. But he didnt start getting them till he openly started to admit he wanted to go to the moon and Tsukasa couldnt accept the idea of his only family leaving him.
As you can see from this picture Amanes books are all torn and he is injured looking terrified as he clutches the curtian
Tsukasa seems to hold a grudge against the world and everything it stands for, perhaps because of the way it treated him for being different.
His words here could be taken in many ways as it could just be him letting out his own anger and frustrations using someone else.
When he wanted Amane to break he wasnt expecting to be killed. But the fact that he was probualy delighted him, esspeically when he would see Amane and Amane would freeze as though terrified. It let's him know that Amane now feels it that Amane knows what regret is and that he isnt perfect anymore. That he is also now stuck on earth with tsukasa
Tsukasa takes delight in the terrified expression of his brother. Knowing that his brother is so full of guilt and regret that he is too scared to come near him once the past is mentioned. Perhaps this is for personal gain and tsukasa wants to manipulate his brother into staying with him longer. He wants to be the only one his brother depends on and trusts. Maybe that's how it was when they were alive and that's how tsukasa wants to keep it.
In this moment this whole scene could of been his idea. His idea to tell the artist that Nene has to kill Hanako. It seems like a fun plot but it could also be taken that Tsukasa feels like his place is being threatened that Nene is now always at the front of Amanes thoughts. That he will start to trust her and depend on her more then him. So if the person he trusts the most kills him or would be the sweetest revenge. Because to him that would destroy Amanes trust in Nene. Bringing Amane back to his lonely self.
Finally. I would like to point t out something small and simple. It may not mean anything but I couldnt help but notice that Tsukasa wears old clothes while Amane wears modern. It could mean nothing but I personally see it as, Tsukasa is stuck in the past and constantly thinking about it, that his main goal is to bring things back to how they use to be. While Amane is in modern clothes because he looks for the future. Always aiming for it and always aiming to atone for his sins. Even as a child he looked towards the future with great hope. It could be another way to show their clashing personality with Tsukasa wanting to stay and Amane wanting to walk ahead.
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