Ten years into marriage, Yuna's relationship has gone cold while her husband busies himself with an affair at work. Left to satisfy her mature body alone, she is reunited with former coworker Oshima. Once close friends, they reminisce, relate to each other's loneliness, and begin pressing lips and bodies together. In a room with a broken air conditioner, they lose themselves in sweaty 69 sex, the only sounds coming from their mouths drinking each other's sweat and juices.