While it isn't necessarily an "adventure" story, but have you seen the anime Spirit Pact? Theres also a Manhua which I personally have yet to read. Unfortunately, its discontinued, but the two seasons it does have are the best for the very reason you're stating now. There is definite romance between the pair, but the romance itself is more of a side thing. So, we get that good BL romance we all crave, but also really nice story as well-as well as an actually really nice development of their bond, romantic or not. I would reccomend it!
I also do strongly want a shounen type anime with some spinkings of actual BL in it. Of course, romance in a shounen can end up ruining the story, but I feel like if it's done right, it would be so so good.
And, while I fully get your frustration, at the same time I feel like this webtoon actually has the potential to be really cute. So at least there's that. :)
http://www.mangago.zone/read-manga/crimson_spell/
Maybe you’re looking for something like this idk
LMAO AFTER I COMMENTED THIS I ACTUALLY FOUND ONE.
It's called "The affairs of the other world depend on a corporate slave" and it's EXACTLY what I mean by having a main plot just with a gay main character. Plus it's Isekai ε=ε=(ノ≧∇≦)ノ
Yeah that’s a good one, good job :)
check out silver diamond
Kyou Kara Maoh Is a good one they have an anime too.
I hate putting my hopes up. Based on the thumbnail, I thought there would FINALLY be a BL manga where the central plot is the adventure story and the romance is a side story. Y'know, kinda like every other Adventure story out there. But I guess society is still too isolated from that