I have played Eternum before this and it is a masterpiece in this genre, so naturally I decided to give OiaL a go. I noticed early on that it has Attack on Titan tendencies and even if Eternum is very well written, there are still a lot of borrowed story elements from movies like Ready Player One. That is totally fine but I was wondering if there will be any indirect Attack on Titan spoilers, since I have yet to continue watching Attack on Titan. Or is it just the key and dad and then that's it.