Series tagged as Mature on mangaupdates:
https://www.mangaupdates.com/series.html?page=3&orderby=rating&perpage=50&genre=Mature&exclude_genre=Shounen%2BAi_Yaoi (filtered to not have shounen-ai/yaoi...
My favorite series (manga and LNs) sorted by genre.
Only awards based on critic/merits will be listed (Shokagukan, Seiun, KLNGS), awards based solely on popularity will be ignored (Kodansha Award)...
Despite some unconventionality in many of these manga - no, because of that - all these titles are great. Enjoy.