I got three fine ones, though one of them is a manhwa but I love it enough to the point where I'll recommend it to everyone.
Shonan Junai Gumi by
Tooru Fujisawa
If you've read or watched it's more popular sequel
Great Teacher Onizuka, this is what came before it.
It follows the infamous biker gang delinquent duo called the Oni Baku, Ekichi Onizuka and Ryuji Danma.
The manga focuses a lot on Japan's Bozosoku (aka Motorcycle Gangs) subculture
It has tons of comedy (early chapters feel more like a gag manga just like OG Dragon Ball did), it has tons of fights (heap load of "You're 100 years too early to face me!" dialog) and it has really memorable and intriguing arcs that have stayed with me till this day.
Genuinely, one of my favorite manga's of all time. While GTO is just as fantastic in it's own right, it's value just increases that much more if you've read SJG first.
Her Summon by
Park Jin-Joon
This is the Manhwa I mentioned.
I gotta be honest, this was probably the most shocking manga I ever read.
Not because it has extremely graphic content but because the plot makes it sounds like some absolute dogshit manga or anime I've already seen before. But I was completely shocked when quite the opposite happened.
The plot is about a socially isolated shut-in who gets summoned into a fantasy world by a young female summoner. Now from that description alone I expected to read some absolute doo-doo feces harem bullshit where the main guy gets all the bitches and he's like the strongest motherfucker in the world because fuck the real world, but it isn't. It's so far, far away from being that.
This story is about growth, growth as a human being. For how immature the main protagonist may appear, the story itself takes it seriously. As the protagonist spends more time in this fantasy world where he can be his ideal hero self, he takes that courage and tries to apply it into the real world. Attempting to battle his social anxiety and social phobias so that he may one day become normal again, all the while supporting someone who doesn't even exist in his world.
If there was ever a story I wanted for someone to know about, it would be this one. I cannot recommend it enough.
Nick to Lever by
Miyata Kyougorou
The funniest Seinen around, follows the lives of two men as they live their day to day lives with absolutely wacky shenanigans.
Each chapter is extremely short (with the exception of the first chapter), each chapter consists of 6-1 pages. Yes, you read that right. There are 1 page chapters in this manga and they're just as hilarious as all the other ones.
The art is also surprisingly detailed for how simple and short it is, every page feels like you're looking at traced over photographs.
