* AdaptationDisplacement: As is the norm with light novels.
* CompleteMonster: Umino's father, Masachika Umino, drove his wife away and has been emotionally [[spoiler:and physically]] abusive to Mokuzu her entire life. [[spoiler:He beat her so badly as an infant/toddler that she lost hearing in one ear and limps around]]. He didn't apparently mean to but, he also [[spoiler:beat his dog to death and not soon later his ''daughter'']].
* ItWasHisSled: [[spoiler:Umino dies.]] It's a ForegoneConclusion in the books but the manga has a more ambiguous intro.
** Umino isn't too interested in the boy that likes her, instead she wants to spend all her time with Nagisa.
** In splash pages and official art Nagisa and Mokuzu are always holding hands and being intimate.
* TearJerker: The manga is notorious for being a mood ruiner. It seems like a normal story about a weird NewTransferStudent befriending a girl and becoming her ManicPixieDreamGirl but it [[CerebusSyndrome goes downhill]] quickly once [[spoiler:we find out Umino wasn't lying about her dad killing her dog]].