Fragments of Memory in the Lost Abyss

When consciousness sinks into the abyss, memories shatter. Amid the ruins of civilization, everything will be lost, until I'm Lin Xiuyuan. I think I've lost my memory, and I'm playing a role-playing game called “Lost Abyss.” The character I'm playing is “Lin Xiuyuan.” That's right, I'm playing myself, fulfilling “my” last wish. The character I'll play next is called, “Jiang Du.” I'm Jiang Du. There's another consciousness inside me, calling itself “Lin Xiuyuan.” It says I'm playing “Jiang Du”? I'm Yu Xiu. I suspect I have dissociative identity disorder. Two other personalities have appeared inside me. Also, I've lost my memory again. Huh? Why did I say “again”? Who... am I?