Ojou to Yakuza: Wakagashira no Aibu wa Amai ga Takedakeshii

あらすじ

Hikari Tsuzuki is the only daughter of the Kumichou of the Tsuzuki Group. For 6 years, she harbored an unrequited love for Akito Fuwa, the Wakagashira—the second in command of the Tsuzuki Group. "I will confess this year!" A love story that transcends social status and age differences between the tsundere yakuza heiress and the loyal, calm and collected Wakagashira begins here! (Source: Bunkasha, translated)