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OMYGOSH I DONT CARE IF THEY WHERE BOTH IN A TERRIBLE SITUATION THE FACT THEY WHERE TOGEHTER FIGHTING WAS ENOUGH AAA AI LOVE MITSUBA AND KOU SO MUCH YEYEYE
Okay now theory time, in my opinion the hole thing under the house was always a thing so when they set up this narrative it didnt matter if there was well no supernaturals the hole would still be a thing but ig in this time Tsukasa never got back home, never bullied Hanako and just became and evil spirit that haunts alone in the school. Because the child version of Tsukasa was always a thing like when Kou and Mc (sorry just fogot her name) went into the old house to find a portal to supernautrals they met child Tsukasa which in a way wasnt connected to the supernatural Tsuakas. So yeah Supernatural Tsuaka the one the got killed by Hanako, the one that bullied him and his parents where afraid of is different from the Ghost Tsukasa.
Ghost Tsuakas is much more cruel he has the moral sense of a child, meanwhile S!Tsukasa is very much a mean character but his moral sense isnt that straight forward evil, he thinks, hes smart and manipulative, he doesnt hurt the main cast as much as he mentally "plays" with them we dont truely know ehat his goal is.
Meanwhile as we just saw G!Tsukasa very much will hurt you and kill you for the fun of it. G!Tsuakas is the one that fell in the hole the og brother who cared very much for Hanako and let himself die for his health, but doing so his morality stayed permanatly twisted as some may know childrens morality when they are younger is quite mean, they scream at your, hurt you, hurt others and sometimes seem happy at violenece, they pull eachothers hair hit kids their age, and these things are usually why the parents have to nurture their kid out of, be softer when play fighting, dont hurt others, dont be mean to others and slowly kids learn to be kinder but G!Tsuakas never unlearnt violence because he fell in the hole and lost any type of mentorship, meanwhile S!Tsukasa is the replacment the one that grew up with Hanako went to school and gained a bit more a moral compus, we dont ķnow his goal, we know he hurt Hanako and his personality was twisted (probs cause he was a supernatural replacment from the hole). Seperate beings the end