Tập 1: Nagi tìm kiếm phiêu lưu tại Nevada nhưng bị bắt cóc trong khi Hayate đối mặt với một cô gái bí ẩn

On September 18, a new semester is about to begin, but Nagi is lazing around as usual. Hayate and Maria try to cheer her up in vain until she gets interested in a TV show about aliens featuring the Area 51 in Nevada, and wishes to go there to investigate. An opportunity arrives when she receives a call from the Las Vegas police department asking her to retrieve some of her late father's belongings who died in a car accident 13 years ago, but Maria states that she is forbidden to go there until Silver Week and Nagi flees from the mansion in anger just to find later that she had forgotten her cellphone and wallet and is unable to get back home until she is found by Hayate when having a spicy drink. Hayate then turns his attention to a small child who approaches him, long enough for Nagi to be kidnapped by some bandits behind his back. Hayate gets on the girl's bike to pursue the kidnappers and rescues Nagi from them. Just when Hayate and Nagi return home, the girl appears before them once more, introducing herself as Ruri Tsugumi and claiming herself to be Nagi's little sister. Ruka Suirenji the idol makes a live performance. (Source: Wikipedia)

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