All You Need Is Kill
Complete | sakurazaka hiroshi, takeuchi ryousuke | 2000 released
The premise was interesting, but somehow, the actual story fell short.
Boku Dake Ga Inai Machi
Complete | sanbe kei | 2012 released
Had an excellent anime adaptation, and the manga was very good as well.
Gantz
Complete | Oku Hiroya | 2000 released
This is one of my favorites. Dark, twisted, sexy, and completely crude - just the way I like a seinen work. A long one, but def worth the read.
Homunculus
Complete | yamamoto hideo | 2000 released
Something so delightfully twisted that you'll be able to lean back in your chair and say "Aah".
Omoide Emanon
Complete | KAJIO Shinji | 2000 released
Very calm. She is able to remember everything about the earth. I actually have to reread this. She's seen things come and go. It feels so beautiful, like a wind that slowly takes you away.
The Melancholy of Haruhi Suzumiya
Ongoing | Tanigawa Nagaru,Tsugano Gaku, Itou Noizi | 2000 released
Akira