Great Reader Onizuka's DNA^2 tribute
DNA 2 by Masakazu Katsura

DNA^2 is a relatively short series by Katsura, spanning only 5 volumes. I like this for its love triangle, of course, and the bizarre plot circumstances.

A boy who is allergic to women, the Tokyo Mega Playboy, DNA bullets and a girl from the future. This is interesting reading. Give it a go!

General Info: published in japanese by Jump comics. 5 volumes. Haven't heard on an english version although translations are available on the web.