Manager Nashizaki Tatsuya of the Pianissimo Club, wants to build the biggest hostess club in all of Japan; a club where men of all ages and nationalities would want to go. And, along with his big club, a huge event will take place, a contest for the number one hostess, with a prize of 100 million yen. Aya, a freshman, doesn't like the idea of being a hostess, but she has to become one, due to a big debt her parents owe. Encouraged by a friend, she reluctantly joins Pianissimo and, so, her life as a hostess begins.

Twenty year old Ogawa Akira is taking the medical school entrance exam for the third time when he is overwhelmed by anxiety and flees the testing room. He soon finds himself wandering the streets of Tokyo lost and exhausted. Then by chance a woman drops her earring, and he picks it up and returns it to her. He is dumbstruck by her beauty. Overhearing that her name is Kyoko and that she works at the nearby cabaret club, he promptly decides to get a job at the club, with the hope of a getting closer to her and maybe finding his place in the world.

Raised in the hope that I would be a boy full of courage and strength, they named me "Yuu." To be a girl filled with kindness and love; that's how my twin sister, "Ai," was raised.
That's how our parents named us - But... Our parents' wishes were reversed.
A story about twins who risk everything to protect one another and to find his or her happiness in the switch they call twins game.