What otome label/circle produce the most dark story?

[Ichisan]

For me personally its Canaria Record, they really know how to write a psycho and dark story, bleak even. With how sometimes they dont hold back in making a scenario that i cant really think something like that could possibly happened, cough Happy Re-birthday and Shinai Naru Thanatos cough, its scary how a person can do smth like that even tho its in fiction, another circle i can think of dark otome is bonecage and parasite garden. Regardless I still enjoy it, how about you guys what circle do you think have the most dark story and what's your favorite dark otome cd?