The confused little A always jumps to different versions of the world inadvertently. (Because the little A in each world actually developed and grew up in this world, so when the "little A" we see as the protagonist jumps into the new world, we see that only the working memory and self-awareness of the "little A in different worlds" have changed. Other long-term memories, including physical status, will inherit the results of the development of different worlds to the current time.)
Purpose: On the possibility of similar and different development of the same personality in different environments.