Sunohara Mirai, an introverted, bespectacled, and somewhat unsophisticated housewife, experiences a strange sensation when complimented on her armpit hair for the first time while playing the piano at a bar. Her beauty, hidden behind her glasses, is revealed, along with her liberated physique. She uses her armpit hair to seduce the men she meets at the bar, engaging in illicit sexual acts with them, her instincts leading to passionate encounters. Experiencing true sexual pleasure with men other than her husband, Mirai abandons her cold family and earnestly climaxes with them.