1999 July in Shanghai
1999 Nen no Shichigatsu
1999-nen Shichi no Gatsu - Shanghai
1999nen 7 no Tsuki Shanghai
July 1999 - Shanghai
The Seventh Month in 1999 - Shanghai
From Beautiful-Soup: "1999" is an angsty and widely varied series about a bunch of teenagers. One of them is the son of a drug lord and so as you can imagine, all sorts of shit goes down, surrounded by a backdrop of convoluted and fluctuating interpersonal relationships.
This is a plot heavy manga with some mildly-explicit sexual activity.