Ojou To Yakuza Wakagashira No Aibu Wa Amai Ga Takedakeshii summary:

Tsuzuki Hikari is the only daughter of the Kumicho of the Tsuzuki Group. For 6 years, she harbored an unrequited love for Fuwa Akito, the Waka-gashira - the second in command of the Tsuzuki Group. "I will confess this year!" thinks Hikari as she cheers to herself, but then, she overhears a rumor of "a woman working at a nightclub whom Fuwa is engrossed with!"A love story that transcends social status and age differences between the tsundere yakuza heiress and the loyal, calm and collected Waka-gashira begins here!长达6年的暗恋、每年都会为那个人人挑选生日礼物。但是却迟迟无法送出这份心意。