Siverfale
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Personally, I believe that no servant (NPC) deserves to be turned into prisms... After all, they answered your call, came to help you save humanity (or whatever we're doing now). You shouldn't turn them into prisms. Even Tamamo Lancer, who gave me Kiyohime, I didn't turn into a prism, but I already turned the second copy into one.
Where do we go?
Where do we end up when we save the world?
Where do we end up when we save the world?