Warau Oni ni wa Fuku Kitaru
Complete | Yamamoto Kotetsuko | 2000 released
I myself am not a big fan on the whole love at first sight type of thing, but this story is somewhat entertaining
Gohoubi wa Shitsuke no Ato
Complete | niyama | 2000 released
these mangas destroying the general "manly seme, (more) feminine uke" consensus.
Dorohedoro
Complete | HAYASHIDA Q. | 2001 released
this story was so long, halfway you forgot what is was about, but overall nice work of art.
Killing Stalking