Ever since she noticed the existence of these special individuals called otherworlders, Iris, as curious as she could be, decided to meet one or two.
One of the factors in how she confirmed their existence, aside from observation, was that she sought information from some people who stood on the same platform as her, and they told her that otherworlders actually existed.
All over the planet, there were only three people who entered the Enlightenment Realm. Iris was one of them and, apparently, the newest member of the group. With that said, Iris took an interest in these otherworlders, as they had the potential to reach that realm.
Five hundred years after the First Pope, Iris reincarnated herself through her abilities, and she was reborn as a human child. The reason she had gone through reincarnation was because she wanted to be at the same age as the otherworlder.