Recently, Eriko, a frustrated married woman who is not satisfied with her husband's work, complains about her neighbor's friend Marina, Yuu. The two, who are free from stress, warn him, "If you don't do that, you'll wither away as a woman." Feeling uneasy, Eriko asks how they relieve her frustration, and she says that she is venting by having sex with a man other than her husband! Eriko is surprised by her friends' cheating, but she is also envious of her unrestrained sex life.
