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.

At the end of the Heian period (794-1185), when the Taira clan wielded power, Minamoto no Yoshitsune, known as Ushiwakamaru, met the love of his life, Shizuka, at the age of seven. Fate tears them apart, and they vow to be together in the future. To protect Shizuka, Yoshitsune goes off to battle, but Taira no Tomomori waits for him, and a woman uses her power as a shield to come on to him with her body... (Source: Mecha Comics, translated)