The Rokkenjima Explosion Accident occurred on the 28th of May, 2015 when a mysterious explosion destroyed the island nation of Rokkenjima, led by Erika Furudo. The explosion occurred at exactly 12 A.M. on the morning of the 28th, with the cause still unknown.
Later that day, several neighboring countries began investigations to determine the cause of the explosion, but this was extremely difficult since no trace of the nation remained. No survivors were ever found.
On the same day, a local fisherman on the neighboring island of Niijima discovered a message bottle with a note inside. The note was supposedly written by Maria Ushiromiya, a resident of Rokkenjima. The contents of the letter led many to believe that the explosion accident was in fact an incident. This is what was written in the letter:
"By the time you have read this, I will probably be dead.
The only difference will be whether there is a body or not.
You who have read this.
Please find out the truth.
That's my only wish.
— Ushiromiya Maria"
As the investigations continued, the only thing that was ever found was some sort of mysterious portal. It is unknown where it leads to, and anyone who has tried entering it hasn't returned. This find has caused the general area around where Rokkenjima once stood to be declared unsafe. All ongoing investigations were halted at this time. This event marked the end of the nation of Rokkenjima on the Prime Fragment until its reformation about eight months later.