Recently, Eriko, a frustrated housewife whose relationship with her husband has not been satisfactory, vents her frustrations by complaining to her friends Marina and Yuu, who live nearby. The two women, who are free from stress, warn her that "if you keep going like this, you'll wither away as a woman." Eriko, feeling uneasy, asks how they relieve their frustration, and finds out that they release it by having sex with men other than their husbands! Eriko is surprised by her friends' infidelity, but she is also envious of their uninhibited sex lives.