* {{Applicability}}: The show's themes about accepting yourself and your inner darkness, and the bonds of friendship, love and connection with others helping you through problems can make the latter half of the show read as an allegory for deep depression. [[spoiler:Sedna convinces Urin to emotionally shut down, cast out people she doesn't like and even those she loves, and feel no one will ever love her, but Marin and Kanon refuse to give up and help her through it, with Marin's love and Kanon's acceptance helping both Urin and Sedna heal]].
* SugarWiki/AwesomeMusic: Throughout, starting with the hauntingly melancholic [[https://www.youtube.com/watch?v=p2C4GD0VAkw opening tune]]. The director also worked on ''{{Manga/ARIA}}'' and it shows.
** The [[https://www.youtube.com/watch?v=Nwx0gJwNa-Y shrine maiden's song]], as well as [[https://www.youtube.com/watch?v=NFNTGlR9tsM Sedna's theme]].
* DesignatedLoveInterest: Kojima, with whom Kanon doesn't even have a fraction of [[PseudoRomanticFriendship the chemistry she has with Marin]].
* FridgeBrilliance: The [[spoiler: way Sedna is dealt with in the end]] makes a lot of sense when looking from a Jungian perspective. To elaborate, in Jungian psychology, Shadows are not inherently evil. A big part of inner growth is accepting it and learning to grow by not running away from the parts of yourself you don’t want to see.
* GrowingTheBeard: The first half of the show is a MonsterOfTheWeek affair, while the second half takes a deep dive into mental health, the meaning of love, and accepting the darkness inside us as natural.
* LesYay: Kanon and Marin become ''very'' close during the course of the series, to the point of Kanon repeating Marin's "I love you" catchphrase in the finale.
* SugarWiki/VisualEffectsOfAwesome: The transformation sequences, Urin's [[spoiler: butterfly wings]], and the red sparkles that [[spoiler: make up Sedna]].

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