Released January 20, 2007. 122 Minutes.

Twin siblings, brother Yori Yuki and sister Iku Yuki, had been extremely close since childhood. However, Yori's feelings toward Iku were more than innocent affection, and only grew stronger over time. Ashamed, Yori distances himself from Iku by pursuing a relationship with Iku's friend Tomoka Kusunoki and plans to transfer to an out-of-town high school. This does nothing to help him forget his lust for his sister, and when the twins get into an argument, Yori confesses his love to Iku. She initially rejects his advances, but fearing rejection may drive him away, she reluctantly kisses him. Yori tells her to wait until she is sure of her love for him, and over the next several days, they try to begin a more intimate relationship, hidden from their parents.