Responses
Hakkenden(๑•ㅂ•)و✧
Nabari no ou
Hakkenden
llegenes
Yami no matsuei
Asterisk
Red River
Basara
Ubel Blatt
Dendrobates
Akumetsu
Kamisama no Iutoori Ni (technically under horror but it's super interesting!)
None are shounen ai, but there's a ton of great action, awesome plot, and interesting characters. The first 2 are more shoujo-ish/well known while the rest are much darker
Any shounen ai manga similar to Silver Diamond, Koori no Mamono no Monogatari? Basically manga with interesting plot, many chapters & great art