Sana Minatozaki, a gatekeeper in training, was sure that she had been everywhere. To every world. Her and two other girls' jobs were to travel to each of the worlds, going on trips to take notes and observe the inhabitants politics and civilisation. Sana, was the most experienced in all of the trainees, soon she would graduate and they would allow her to interact with the world. Sana by now, had been to every world in all the corridors of doors. Every single one. Except one. It had always been marked as for qualified personal only, with a red mark across the handles...this was an irrational. They had only ever read about such worlds, worlds that had no sensible civilisation, ones that were so utterly bonkers and bat crazy, that it was dangerous. 

I've also posted this fanfic on my wattpad, where I have the same username.