Yuki Kazuo is the Queen of the largest Yakuza in West Japan. She grew up with all the Kobun of her father as her playmates. Their favourite game is yubitsume. Their past time is gambling, turf wars, extortion, loan-sharking, drug trafficking and prostitution. And as his father, Taoka Kazuo, aged and soon to retire the next Oyabun will be her. But Yuki doesn't want to be the Queen of Tekiya Clan. She just want to have a normal life that is why she ran away. She left and went to the place where her father met her mother, the Philippines. And instead of becoming the Queen of Yakuza, she wants to be a teacher like her mother. And that's how Yuki found her self as the Advisory Teacher of Montenegro High School's Class D. What will happen if the most feared Ice Queen of a largest Yakuza in Japan meets the Montenegro High School's section of delinquents?