Responses
https://www.mangago.zone/read-manga/sennen_darling/
I think this fits all the criteria. It has very sporadic translations though.
I don't know about BL
But this manhwa is kinda have what you want, lots of plot and sci-fi: "Unsound relationship". There is also a manga called Himitsu – Top Secret by Reiko Shimizu.
Do yall got any BLs that is Action and shounen ai. It must contain a bunch of plot within the story. Also would appreciate if yall got any sci fi ones too ヾ(☆▽☆)