The wife, Mai, who is living with her much older husband, starts a part-time job to escape the gloominess of being at home. What she actually begins is a part-time modeling job at a studio, attracted by the beauty of her plump, lovely lips. Unable to refuse the man who seeks high-quality shots and aggressively approaches her lips, their interaction escalates from massage to kissing. Each visit leads to her being pleasured and trained from her lips. "Hmm, something feels different today..." Her husband is unaware of this sinful relationship she cannot confess.
