Not sure what exactly you mean by neogothic, but maybe you'd like this?
https://www.mangago.me/read-manga/drcl_midnight_children/
Oh I'm actually reading this. I love his works.
Yeah he's an incredible mangaka. Maybe try Tanabe Gou's works? He does adaptations of H.P. Lovecrafts books:
https://www.mangago.me/read-manga/h_p_lovecraft_s_the_call_of_cthulhu/
It's not what I'd describe as gothic though. A more fitting manga would be Vampire Hunter D:
https://www.mangago.me/read-manga/vampire_hunter_d/
More plot focused than romance focused.