The criticism that "Boruto" introduced an alien element too late into the series isn't entirely warranted, as "Naruto: Shippuden" subtly hinted at the extraterrestrial nature of Kaguya and the Otsutsuki clan. While the original manga gave limited backstory on Kaguya, episode #460 of "Naruto: Shippuden" provided Earth's first record of her arrival, depicting her as a celestial maiden who descends from the sky, a subtle nod to her potentially being an extraterrestrial.
This foreshadowing is reinforced when examining how the God Tree, closely linked to Kaguya, arrives on Earth via a meteorite, commonly associated with outer space. Additionally, Kaguya's mythic roots in Shinto mythology align more with an alien origin, mirroring how her character in Naruto ultimately became the moon when sealed as the Ten-Tails. While some may find the extraterrestrial concept challenging to grasp in the fantasy world of Naruto, it's crucial to acknowledge that "Naruto: Shippuden" had already hinted at Kaguya's alien nature before "Boruto" confirmed it. Effective foreshadowing enhances the believability of such twists.
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