I really enjoyed this work especially in its somewhat nuanced portrayal of vampires and their interaction with human society. The art felt plain but enhanced by the style in key moments. For the most part the characters felt realistic and their growth seemed natural except for one problem which I blame on the story structure and not the writing of the characters.

My biggest problem with this story is the sheer irrationality that is displayed in the context of the humans hatred of vampires. It doesn't feel in any way justifies especially when we learn later in the story that no vampire has killed a human in the several hundred years since the war. This story works well as a vampire romance story but its other focuses in regards to hatred of vampires fall short. Below will contain some spoilers to show some of my grievances with the story.

SPOILERS
The key conflicts in the final act are caused by an exterior action in which a vampire kills a human. However this is again solved in an exterior manner when it is revealed that it was in fact a human that committed the murder. In my opinion this murder should have occurred at the start of the story to give humans a legitimate reason to hate vampires as their hatred seems irrational and I cannot empathise with many of the characters until they see the irrationality of their hatred. However, this change doesn't feel like major character growth but merely starting to actually think rationally. I think another improvement would have been to have the investigation into the murder an constant throughout the story with the possibility raised that it could be a human that committed the murder. This then would have allowed some more interesting interactions in the context of hatred towards vampires within the school.
END OF SPOILERS

For what it's worth Orange Marmalade is a refreshingly original take on vampires and vampire romance with some mild problems in the story but an enjoyable read nonetheless and definitely something I recommend.