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Touko works part-time at a convenience store, but recently her daughter has grown apart and she has become estranged from her husband, leading to boring days. One day, she hears that her co-worker and daughter's boyfriend, Himori, broke up with her daughter because he had too strong a sex drive... She invites him to become her sex friend, an easy way to release her sexual frustration. But the pleasure wins out over her guilt towards her daughter, so she continues to have an affair with Himori whenever she has free time after coming to work. And today, she punches out again...