Yusa lives with her husband and son. Despite having a student son, her husband casually makes advances on her, being a lecherous man. The son grows tired of seeing this every time. One day, after witnessing his parents having sex, the son's pent-up desires explode. The next day, he tells his mother, 'I can't take it anymore!' and forces himself onto her, pushing her down and raping her. Yusa reluctantly accepts it at that moment, but gradually, different feelings begin to sprout...
