As far as I can remember they didnt give a specific reason. She just happened to have already died when he started to look for her.
This is the Reinhardt from the future that stole her first kiss. He kept thinking about her after she left back to her own universe and was like “you know what, I want my own” and went scrolling through different AU’s until he found her about to ☠ after killing the royal family, specifically the prince and entire castle maybe after they’d enslaved her for her talents
In wich ch does he steal her fk?
It just said she got into an accident when she was young and died. So that’s why he also never knew who she was before. She died before he was brought in as a pet.
I completely forgot the plot of the side story, can someone explain why she was dead in the beginning in this universe?