I'm watching Manner of Death too. Doesn't it get better and better every week??
Some non-high school BLs I'd recommend are:
Like in the Movies - A love/hate puppy romance w/ socially impactful content. Amazing soundtrack!
Trapped (as recommended above) - Action packed cop mystery w/ many cute and spicy BL moments. The tone isn't quite as dark as Manner of Death.
Cherry Magic - A mild supernatural comedy. The cutest, most adorable, wholesome, aww-inducing BL you'll ever watch.
Ossan's Love (2018) - Love triangle, office comedy. Very eccentric and hilarious!!