AU:
in the last chapter of the second season of Sbg Aiden and Tyler get on a bus, in this AU the bus stopped in a parking lot, Aiden and Tyler got out, but as they were being wanted by the police they had to hide. They hid in some establishment, the two were worried about the others, but they didn't have much to do in that situation, since they were at least two hours away from the others. After a couple of days the police found them, Tyler and Aiden tried to escape, but the police were outnumbered, the two were erased, but for some unknown reason, when Aiden woke up, he was not in some police station or in some totally white room again. Aiden was in a totally unknown location, after a while wandering around the place, he met a woman, she said her name was Tsutako Tomioka, she said she would take care of Aiden, Tsutako also told him the place she was in, a place in Japan where they like to keep Eternity (Raiden?) So they didn't use electronics there. Tsutako also explains that a few months ago monsters began to appear at night, which they called "onis". Aiden started living with Tsutako, he didn't want to but he had to change his name, he hid Giyuu Tomioka, he tried to contact his friends but it was basically impossible without some electronics. After a year Tsutako died by an oni. Tomioka (Aiden) decided to avenge Tsutako, and trained to become an Oni hunter (he didn't meet Sabito here). With all these events that happened to Aiden, he ended up "reviving" his past self. Where he saw no value in life, as we saw in the chapters of Sbg. He also didn't have to dye his hair. much less his lenses, which were left in the bathroom of that gas station in the last chapters (where we found out about the "nightmares"). Tomioka (Aiden) didn't see any of the hashiras as his friends, he just wanted to see his friends again, his real family. On a random mission Tomioka (Aiden) meets Tyler again, but Tyler doesn't recognize him at first. Then Tomioka(Aiden) introduces himself. But how did they end up in this place?