* The fact the promise girl was actually [[spoiler:a fusion of Keitaro's childhoo memories of Naru and Mutsumi]] may have been hinted at ''very'' early: in Keitaro's fever dream the promise girl played the role of [[spoiler:princess ''Otohime'']], but when the Tamatebako was opened and everyone grew up her silhouette looked like [[spoiler:Naru]].
* Anime!Naru puts Keitaro through horrible abuse throughout the series, never apologizes, abuses his friends for laughs and even tells the other girls to join in and to torture Keitaro's aforementioned friends. Keitaro ends the series married to this woman. He is, in essence, trapped in an abusive relationship with a unstable woman. DownerEnding anyone?