出身低又平凡的小蛇葉雲，不小心得到「吞噬進化系統」，從霧隱山脈的無名小蛇出發，吞妖怪一直進化。結果竟然在試煉中得到蛇母的欣賞，這獎賞讓葉雲的姐姐們超開心～青瞳蛇族就要起飛了嗎？但葉雲怎麼總覺得怪怪的...
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