Tsubaki, a high school girl whose grandfather was the head of a yakuza clan, had a crush on Kujo, a top man in the gang. She wanted him to see her as a woman, but he always treated her like a child. Then, Tsubaki was given the big responsibility of nominating the next head of the clan. Kujo protected her during the battle for leader, but when a marriage proposal with a rival clan was made, his attitude changes drastically! He was the man who had protected Tsubaki for all this time, too long to let anyone else do this to her. As his lips trailed down her neck, her body trembled with pleasure and delight... (Source: Tulle Kiss Bunko, translated)

Tsubaki's the granddaughter of the head of the Kiryu Clan, the biggest yakuza organization in the Kanto area. She's also in love with Soya, her grandpa's right-hand man. She saved his life 13 years ago, and ever since, he's been a faithful member of the clan. But, what Tsubaki wants isn't for him to be with her because she saved his life or her relation to the head of the organization. She wants Soya to love her as a woman. Unfortunately, Soya keeps treating her like a little girl, and she doesn't know what to do. But, one day, her grandpa gives her a very important role... a role that will determine the fate of the Kiryu clan...!! A heart-pounding love story about a mature, older right-hand man and the granddaughter of the head of a yakuza clan! (Source: Renta!)

https://www.cmoa.jp/title/273374/