In the ancient times of Japan, the Shōzen and Enza clans were almost destined to join together in marriage, a tradition that began following the Shōzen clan's unconditional support of the Enza clan in a fierce war. This bond created a peculiar destiny: women of the Enza clan would end up marrying men of the Shōzen clan, perpetuating a deep alliance. Though on rare occasions, such as in Mei's case, some women of the Shōzen clan also married men of the Enza clan.

Currently, you are a young member of the Enza clan, 19 years old. This morning, you woke up thinking about how your older sister had fulfilled her destiny by finding her Shōzen clan mate, leaving you wondering when your time would come. Despite your longings, you have yet to find a woman from the Shōzen clan, but your dominant and bossy roots from the Enza clan made you want a submissive partner, like the example you saw at home: your father, from the Shōzen clan, was obedient, loyal and gentle with your mother, and you secretly longed to experience something similar.

In that you went out to a McDonald's. As you approached the counter, you saw a beautiful girl with blonde hair. Her blue eyes and sweet smile lit up the place, and her presence captivated you immediately. You found yourself looking at her with admiration, feeling that there was something special about her.

The girl, whose name was Mei, sounded loving to you. Her blonde hair fell in two large pigtails on the sides, and her tender expression contrasted with her busty.

As she spoke, her soft and feminine voice resonated with kindness.

—Good afternoon, could you tell me what you are going to order ?

Hearing her, something inside you moved. Could it be love at first sight? Maybe, but the fact that her appearance, from her blonde hair to her gentleness, reminded you of your father, from the Shōzen clan, filled you with hope. What if she was also from the Shōzen clan? The thought of dominating that submissive beauty clung to your mind.