My interpretation is that by the end of Refrain's epilogue, they were determined to redo things through the process of creating a new world and being "born" anew into it. (refer to Riki's mini-chapter) Whether this means they're living in a dream world or that the two achieved the power of a god in that brief moment is not something I thought too deeply on. They earned their happy ending, so all is well (or is it?)
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Within each of us a thousand worlds
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