Saiyan Ultraman.

Summary

In a desolate Earth void of humans, Sero Ultraman battles robots in a cosmic realm. A voice urges him to save Earth from impending doom. Upon arriving, he finds a strange, human-less world. Ning Xue, witnessing Sero's arrival, realizes she’s in the Ultraman universe. Meanwhile, Da He, a young boy, discovers a bracelet linking him to Sero. Despite his reluctance, Da He is urged to embrace Ultraman's power as a monster threatens them. Gauss Ultraman intervenes, showcasing his strength. Amidst the chaos, Ning Xue reflects on her surreal experience in this world filled with both danger and wonder.

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