I'm tired of looking at godawful shonenshit, moeblub rubbish, slice of life boringness, and monthly flavor mediocrity.

Give me some good seinen, preferably a "genre"/"speculative fiction" title. I don't want "slice of life" shit, I don't want "sports" shit (imagine reading a golf manga, for example), I don't want coomershit, and I sure as shit don't want increasingly gimmicky, yet still dime-a-dozen "accidental travel"/"portal fantasy" garbage (or as people call them today, "isekai").

And for god's sake, don't recommend me the surface-level shit that everyone knows (i.e. every title listed in this Wikipedia article: https://en.wikipedia.org/wiki/Seinen_manga).

While a "gekiga" art style isn't necessary, it is preferred. And while I'm not particularly fond of comedy manga as a whole, I am open to trying to things to see if one works out for me.

Korean manhwa/webtoons, Hong Kong comics/cartoons, Taiwanese comics/cartoons, Chinese manhua/cartoons, and even Vietnamese comics/cartoons are fine, just as long as they're sufficiently "seinen-y" or "mature" enough (not necessarily in a "tits, gore, body excretions, and shock value" way, but definitely in a "high art" way, the same way the Illiad and Odyssey are considered "high art").