DanMachi: Is It Wrong to Speedrun a Dungeon?

What if, Zeus never raise a mere child thus to be called Bell Cranel?
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What if, Hestia didn't lazy on her Familia's growth?
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The story begins with a kid, desperate for a search of his lost little brother. Until his grandfather told him that he must find the Goddess of Smithing first in order to trace his little brother.
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Will he succeed finding his little brother?
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Will he be brave enough to unravel a story behind his little brother missing?
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This is my first fan-fiction writings.
So please enjoy!