The island was the site of a prison colony for Wa, until the prisoners were relocated to Ibhei, a larger island. The prison was abandoned and left to fall to ruins.
Kazuo Tokuri was the last prisoner to be held on the Isle. He was nephew to the former shogun, Matasuuri Shogoro, and had been framed for planning a coup. He died there, and his spirit was said to still linger in the ruins of the prison by 1357 DR.