被稱作「春畫先生」的古怪研究員芳賀一郎（內野聖陽 飾）失去了妻子，像隱士一樣獨居並致力於春畫研究。在咖啡店打工的女大生春野弓子（北香那 飾）在店內偶遇芳賀，為他深厚的魅力所吸引，一腳踏進他醉心的春畫世界，並成為他的門下弟子。隨後，渴望芳賀早日完成「春畫大全」著作的責任編輯过村（柄本佑 飾），以及芳賀亡妻的雙胞胎姊姊一葉（安達祐實 飾）更為兩人世界掀起巨大波瀾。在春畫鑑賞的學習中，開啟了弓子對性與愛的不同視野……。 電影透過年輕女子的眼睛，一窺「春畫」裡屬於江戶時期地下文化，性風俗背後的華美。這是日本電影史首度將「浮世繪春畫」赤裸裸的呈現在大銀幕上，飾演女主角弓子的年輕女星北香那片中有多場大膽的裸戲上陣，為電影犧牲、敬業十足。

Yumiko Haruno works as a waitress at a cafe that has been around for a long time. She spends her days aimlessly and without a dream for her future. On an ordinary day at her job, Yumiko notices middle aged man Ichirou Haga looking intently at shunga (Japanese erotic paintings that were popular during the Edo period). He suddenly talks to her and asks her what shunga is to her. Yumiko becomes interested in the eccentric shunga researcher and he invites her to visit his home to learn more. After his wife pass ed away, Ichirou has lived a reclusive life and concentrated solely on his study of shunga. Yumiko visits his home and begins to take shunga lessons from him.