Rian melintas ke dunia monster dan tanpa diduga menjadi monster tingkat F yang nggak berguna dan ditertawakan semua orang. Di saat sekarat, ia aktifkan sistem evolusi dengan melahap. Berubah dari ular menjadi naga dan akhirnya berevolusi menjadi Naga Purba. Menghadapi gelombang monster dan lawan yang kuat dari negara lain, dia pun bekerja sama dengan manusia untuk melawan dan berevolusi menjadi yang terkuat.
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