Nagi's Long Vacation

Episode 9 (1x9)

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When Nagi’s mother, Yuu, comes to Tokyo unexpectedly, Shinji blurts out that he is Nagi’s fiancé. Before they know it, the two young people find themselves trapped in a lie with no means of escape. Meanwhile, the sight of Nagi and Shinji together causes Gon to experience intense emotions such as he has never felt before.