When asked about his past birthdays Idia explains that he would always receive a lot of games from his parents, but he would win so often that Ortho would get frustrated.
Idia says that, as a result, he “shifted more towards analog games that used roulette wheels and dice…that way, Ortho could have fun playing without having to master any gaming techniques.”
“Idia made me a treasure map that year…he set up a whole bunch of puzzles on the route there, too. He put so much effort into it! Back in those days, I used to talk constantly about how much I wanted to go on an adventure—an idea I got from the video games I played with him. And my brother granted my wish!”
Ortho might be describing events that happen both before and after original-Ortho’s death: The conversation between Idia and Ortho that leads to Idia accidentally setting loose the monster that attacks Ortho, and how Idia tried to make up for it afterwards, once he’d created robot-Ortho.
He also says that they would often read picture books about the king of the underworld together when they were kids, but it is unclear if he means before or after original-Ortho’s death.
He also mentions a time when he used to follow Idia around everywhere, which could also be both before and after original-Ortho.
There is a fan theory that original-Ortho was killed by Grim, who has no memories beyond waking up alone, hungry and cold.
“What happened after that again? It’s all so foggy…”.
The creature that kills Ortho is described as a “monster,” not a phantom, and there is a possibility that the “ROS” of “ROS-3367A” (the ID of the escaped monsters) is for “Queendom of Roses, while Grim possible based on Alice in Wonderland’s Dinah.
An interesting, but yet unproven theory.
Twisted Wonderland Reference Note 