"Now, answer me. Why do you have Dark Energy?"
Saintess Amelia asked again.
Saintess Amelia sure was persistent in that question. Zero didn't know why she was so adamant about it.
Even in the novel, there was no mention of the Demon Princess threatening Saintess Amelia's life, so he didn't know why Saintess Amelia hates Dark Energy.
The girl asking the question was his savior, so he could not refuse her. But it was not like anyone could believe that he could use the Dark Energy because of the memory from other parallel existence.
( Now, how do I explain it to her? )
This world didn't have any concept of a parallel world unlike on Earth. Earth was much developed in their way of thinking and would always assume that everything was possible including the existence of a multiverse and parallel world.
However, Edolas was different. Everything would be magic-focused, so they don't research much on other spaces; rather the research is about Dungeons, Gates, and Artifacts.
