Everyday Witch

What are witches? Are they the poor women who were captured and burned by the church? No, they are born immortals with powerful magic. They roam the starry sea and make thousands of races tremble.
What would a Blue Star person bring to this world? Would he bring a little bit of abundance to the starry sea, or would he bring a new race that would attract countless witches' love?
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This is a story about a clever human witch who struggles and gets around in the witch world.