After the death of his father, Koutaro takes over the family-run Sakura Market, struggling to protect the business from a greedy rival while managing complex desires for his non-blood-related mother and sister. To cope with the stress, he enters a secret sexual arrangement with an employee named Touko, but his repressed longing for his mother eventually boils over. In a moment of shared vulnerability and grief, Koutaro crosses the ultimate line, initiating a forbidden relationship to provide comfort and claim his own happiness.
Yusuke and Akira begin their married life with clumsy excitement, but their bliss is soon threatened when Yusuke starts working as an assistant director at a movie studio. He falls prey to the advances of the seductive actress Misaki Atsuko, who lures him into a secret encounter at his own home. While the affair unexpectedly sparks a renewed passion between Yusuke and Akira, Atsuko reveals her intention to steal Yusuke away, leaving him to struggle with his guilt and his devotion to his wife.