49-year-old married woman Nami possesses a beauty that defies her age, showing no signs of nearing the half-century mark. Until her mid-forties, she had only been intimate with two men: her husband and a previous boyfriend. Living a typical housewife's life with her retired husband and their adult son and daughter, her world changed two years ago when she met a man who revealed to her the true essence of being a woman. Though she broke off that affair a month ago, unable to fully let go of her lingering feelings, she has now embarked on a new path of infidelity to sever her emotional ties once and for all. Her indulgence in pleasure at a hot spring inn marks a clear departure from the life she once knew.