see you in another life

Long ago, the world was divided into two, Nirvana and Nether, it only became three, because of that one small mistake that hasn’t been resolve even after a thousands of years... — In a place called Nirvana, there lived a girl, named Jaei Illexia, she’s engaged with someone she hasn’t even met yet, and clearly, she doesn’t want the wedding to happen, to cut it short, she doesn’t want to get married. So she came up with a lot of different plans to escape, she plans to runaway- not temporarily, but forever. But her plan always fail because of her cousin, Pita, who is also a royal, but was hired to take good care of Jaei for Jaei’s parent’s knew beforehand that she will try to escape. They hired Pita because of her charm, Eternal Binding. One day, J’s plan succeeded, but she’s now joined with Pita and a guy named Justice, and when they were ready to voyage in the open after escaping the imperial palace, something stopped them, a barrier, confused of what the barrier is, they tried hitting it, but nothing came through, when they were about to lose hope, J threw another rock at the invisible barrier and it magically went through. Thinking its safe, they decided to also go through the barrier, but something unexpected happened... they’re in a different place? What is this place? What was the reason for the barrier? What was that small mistake? And how to resolve it? And what does it all have to do with J?