Zipman!! (manga)

Zipman!! is a manga created by Yusaku Shibata and it is currently serialized in Shueisha's Weekly Shonen Jump.

Plot
World-famous handsome mechanical engineer Koshiro Tatara and scary-looking musclehead Kaname Tatara, these polar opposite twins both fell in love with the same girl's smile. Since then, they compete daily to see which of them can make her smile more. But one day, tragedy suddenly strikes Koshiro...

Chapters

 * Main article: Chapters and Volumes