Responses

I've been reading a few of these since I was a teenager, so even if it's ongoing, I'd consider these classics. I don't know about dark, but here's some if my faves with good plot:
Akatsuki no yona
Keishichou Tokuhanka 007
Reimei no Arcana
Skip Beat
Hana to akuma
NG life
Mahou Tsukai no Yome
Merupuri
1/2 Prince
any recommendations on kind of old classic romance mangas and are complex and have a good plot. Also like a mature maybe even kinda dark :)))