"I sold myself that day..." A man and a woman share a kiss in a foreign city during the Warring States period. This is the story of a couple who, swept up in the turbulent waves of history, pursued freedom and remained true to their love. The husband was a Portuguese merchant, and the wife was Japanese, and a "slave." Tatsu, a headstrong girl, follows Shino, who she grew up with like family, onto a trading ship in the Nagasaki harbor, where she meets Leo, a fearless young man. What will Tatsu do when she sees women being forced into the bottom of the ship as slaves and being hurt by the crew's despicable acts?! The author of Ao ni, Fureru. weaves together historical facts about "Japanese slaves" in this epic romance and love story! 「私はあの日、我が身を売った――」 時は戦国、異国の街でキスを交わす男女ふたり。これは歴史の荒波にのまれながら、自由を求め互いを愛し抜いた夫婦の物語。 夫はポルトガル商人。妻は日本人、そして”奴隷”だった…。 勝気な少女・龍（たつ）は、家族同然に育った志野を追いかけ長崎港の貿易船に乗りこみ、精悍な青年・レオと出逢う。 奴隷として船底に押しこめられ、船員の卑劣な行為に傷つけられる女性たちを前に龍は――!?