Kana's parents passed away 7 years ago and she had to drop out of school to earn money to support her younger sister. The girl seems to like to be touched, but she will be obedient and must study hard. But it's different from what Kana thought, his older brother often gambled and joined gangs. One day, he returned home in fear. When questioned, Cana discovered that her sister had stolen her brother's money and poured it into gambling. He invites you to meet him, and he certainly won't save your life. Kana decided to go with her sister to the boss to apologize for loving her sister too much. Upon seeing Kana, her grandmother was impressed by her beauty. He agreed to forgive his brother's debt, but only on conditions. I mean … you have to become a girl in ten days!!! Then her new life began. She is only allowed to wear sexy underwear or be nude, so even in front of her juniors, she can seduce her whenever she wants. But her boyfriend couldn't give her the pleasure of her brother's big and strong cock.