I know there is a manga Romeo x Romeo, and that is not quite what I'm looking for.. Just like the story romeo and juliet, I want to read about our two main character who are rival (either because of their family or due to different social status or they are student compete for best grade or couple of delinquent fighting for territories - any form of rivalry, etc) end up falling for each other ~ obviously 😃 for example Kirai Kiraimo.. I read a few before but I can't remember their title, I dont mind even if they are novel just throw them my way..

A good novel tells us the truth about its hero; but a bad novel tells us the truth about its author. - G.K Chesterton

1999 shanghai is the first thing that comes across my mind when talking about a yaoi version of romeo and juliet. Though the art is pretty old, but it should be fine once you get used to it. About two gangs that are rivals/at war with each other.

10 dance There's quite a lot of sexual tension in this one imho 😀

Junketsu drop can't really remember much about this one. Should be pretty close to what you're looking for. Two students in different departments that don't get along.

Iberiko Buta the first couple.

Thnk u, but I've already read them, thou it doesnt hurt to read them again. They are good mangas especially 10 dance, still it is excruciating waiting for updates - if this is a form of torture I'm already dead. How I wish I can read kanji!

I know I can simply just look under rivalry category or sth similar but sometimes there are few manga that slip from being categorises as such..

A good novel tells us the truth about its hero; but a bad novel tells us the truth about its author. - G.K Chesterton