the boyfriend theme doesn't make sense! When Marika was taken to the world where there are men, she was 8 years old. How could Marika from that world have a boyfriend at that age and that there were misunderstandings?

My theory is: uuruno was already an habitant of the world of lily. When they were little they connected but after a short time they experimented with her and sent her to the other world. For her it was normal to marry girls and that was the problem she had as a child in the other world since others saw it as weird and made her start to want to be normal. The other uuruno is not satisfied with staying in that world and was looking for a way to return.