Black Bird vol. 9
Boys Over Flowers vol. 7
Dawn of the Arcana vol. 4
Demon Love Spell vol. 3
Backstage Prince vol. 2
Demon Prince of Momochi House vol. 1
Does the predominance of abusive relationships in shoujo indicate anything unique to Japanese culture?
Short answer: No.
Long answer: Nooooooooooooooooooooooooooooooooooooooooo.
An audience member asked me this question at my Geek Girl Con panel, and I was so taken aback that for a moment I could only sputter, “I’m really not comfortable with that question!” Luckily, another person in the audience jumped in to point out that no, it’s definitely not something unique to Japanese media, which gave me enough time to regroup and give a better thought-out answer.