While Boruto already has quite a mixed reception, with many fans wishing that the series ended with Naruto, and this twist threw many off even further. What they might not know, however, is that this extraterrestrial revelation actually makes a lot of sense.
Series creator Masashi Kishimoto loves to pull aspects and characters from Japanese mythology and incorporate them into Naruto. He's done it with the strongest jutsu in the series, as well as some fan-favorite characters. Likewise, while villain Kaguya Otsutsuki is the first of the aliens to invade, she too hails from the world of Shinto mythology.
Similar to how Kaguya came to Earth a thousand years before the events of Naruto, the tale of Princess Kaguya is the oldest known story in Shinto lore. Her tale begins when a bamboo cutter finds a baby girl in a bamboo shoot. Having no children of his own, he adopts the child and he and his wife raise her. After this, the bamboo cutter finds gold whenever he does his job, and quickly becomes rich. Kaguya grows into a beautiful woman, and many seek her hand in marriage, including the emperor. She refuses them all, stating that her heritage does not allow for it. She becomes erratic, and eventually reveals that she is a being from the Moon, and her time to return has come. A heavenly entourage arrive for her, and she reluctantly leaves with them, leaving gifts and letters behind for her family and friends on Earth. When her parents become sick, the emperor takes the gifts and has them burned on the tallest mountain in Japan as a message begging Kaguya to come back.
In the series, Kaguya came fully grown and with evil intent, but the myth depicts her as a caring and loving being. If there's one thing that both depictions do have in common, it's the fact that Kaguya is an alien from another world. While fans may argue the addition of aliens into Naruto lore doesn't work in the series' favor, one thing they can't say is that it came from nowhere.
Aliens being the cause of everything in Naruto did not get the best fan reception, but there's no doubt that it actually is in line with Kishimoto's previous adaptations of Japanese myth. However, despite the ancient story being about a good natured being, Kaguya Otstutsuki, and the rest of her clan are terrible villains in the Naruto/Boruto franchise. While there are many ways Boruto strayed from what made Naruto great, it was following the original's ninja playbook with its alien reveal, even if it could have merged this idea better with its existing lore.
