User blog:Spinariosthorn/theory about tsukasa and Amane

Meet - the first and the most favourite theory.
Although it's probably just a retelling of the Manga from my point of view but I'm 90% sure it will turn out to be canon.

The Creature took little Tsukasa and locked him in the Red House in exchange for Amane's life.

Kou and Nene got to the world and to the time interval (those six months, as the manga said) where Tsukasa was trapped in the Red House and told him that he had to get back somehow. He was never supposeed to return but he did because they also said that Amane would kill Tsukasa at the age of 14 and then kill himself (which wouldn't be true if Tsukasa hadn't returned) and this absolutely broke Tsukasa since all his troubles and efforts suddenly turned out to be pointless. I think The Creature and Tsukasa made some kind of deal that allowed Tsukasa to get out. And when Tsukasa returned six months later The Creature was already in his chest, but no one could tell he was possessed for one simple reason - Tsukasa's personality was still there, just fused with the Creature, rather than the Creature replacing Tsukasa. Roughly speaking, there are no two "evil spirit Tsukasa" and "nice child Tsukasa", it is the same person, a symbiosis of a child with an evil entity.

Here is some evidence:





Now at this part I feel very insecure, 30% confidence tops.

Tsukasa may have behaved very violently with Amane afterwards (it was shown he was always beaten up, maybe it was because of Tsukasa after all). This violence could appear probably because of The Creature in Tsukasa's body, and possibly because he had a grudge against Amane for future killing him. Amane couldn't bear such attitude and murdered him, after which he killed himself bwcause of guilt. It probably happened at school since the brothers can't leave this place. And about the family suicide mentioned, I think parents couldn't accept the death of both their sons.

And here's where it's a thousand times canon, literally manga retelling, 100% certainty:

Tsuchigomori-sensei said that Amane changed his fate - so why did this happen if fate is written at the moment of birth?

Because it was interfered with twice: once by Nene (his and Amane's meeting at a festival, where instead of wanting to go into space he wrote that he wanted to see her again), and the second time by Kou (when he told Tsukasa the future and made him go back). The tragedy is that Nene wasn't supposed to see Amane and Tsukasa was never supposed to return - that's the only way Amane would have lived up to the future where he became a teacher.

Yes, Kou and Nene made gross mistakes, but to me, a fate where everything goes according to Tsukasa's plan (Amane lives happily ever after, Tsukasa stays at red house forever) is also pretty sad. I don't know which is better anymore, I'm still pretty heartbroken.