Negai Kanae Tamae(2005)

Negai Kanae Tamae

Kinukawa Yuusuke is a second-class pianist who earns a living by playing in small bars and clubs. His simple life soon becomes complicated when a yakuza area boss named Fukami Hikaru shows up at his current workplace. As Fukami's appreciation for Yuusuke's piano playing grows and he begins to visit more and more often, Yuusuke's feelings for Fukami become unbearable - despite his guilt over being attracted to a criminal. One night, in a desperate attempt to get Fukami's attention, Yuusuke spills a drink on him...

Included one-shot:
Volume 2: Boku wa Taisetsuna (My Precious One)