I have noticed there aren't many 2018 or ongoing series in this thread...so here are some ongoing series I'm watching/reading atm:
Irozuku sekai no ahita kara -cute, drama, romance
I just trust P.A.works with this and it's been really cute so far (P.A:works are the creatoros of anime like angel beats, another, charlotte, sakura quest, tari tari..)
Banana fish -action, drama, shounen ai
this is a summer 2018 anime but it's still ongoing, please check it out even if you don't like shounen-ai or yaoi cause the story is still so fucking good, seriously.
Beelzebub-jou no okinimesu mama -cute, comedy
I find this one simply pleasing to watch because of the adorable art and colours, the story is what it is but yeah...still so cute to watch
About manga mhh...
an author I have been enjoying a lot lately is Kenjii Tsuruta, (I think he's already super popular but it's still worth mentioning in case someone doesn't know his work) most his works do not really have a story and there's hardly any dialogue in them but they're so fascinating and beautiful *-* oh I said it would have been ongoing manga but all of his series are completed I think..
And for my fellow yaoi fans out there please check out the ongoing manhua Here u are by DJun