One of the most popular BL series of all time, manga Bronze. 
It’s the sequel to Zetsuai -1989- (絶愛-1989-), which was initially published in the 1990s. I love them both. This revised version (called BRONZE -Special Edition-) of the original series includes a recently compiled 15th volume.
Author: Ozaki Minami (尾崎南)
Publisher: Shueisha
Language: Japanese (raws)
Volumes: 1-15 (complete)
Source: purchased by me
Volume 1: 
Download »46.91 MB
Volume 2: Download »51.25 MB
Volume 3: Download »57.1 MB
Volume 4: Download »53.8 MB
Volume 5: Download »66.71 MB
Volume 6: Download »59.85 MB
Volume 7: Download »68.57 MB
Volume 8: Download »63.45 MB
Volume 9: Download »65.9 MB
Volume 10: Download »73.23 MB
Volume 11: Download »66.31 MB
Volume 12: Download »70.45 MB
Volume 13: Download »66.72 MB
Volume 14: Download »68.51 MB
Volume 15: Download »59.64 MB
Description from Baka-Updates:
Kouji and Izumi are still playing one step forward, two steps back in their angst-ridden dance of love. The drama is taken to new heights in this series: just how far will Kouji go in his desperate love for Izumi? Will these two ever be together and be happy at the same time?