A son is sent off to work part-time while lazing around during winter break, told to earn some pocket money on his own. He ends up working at a convenience store owned by his mother's friend, but he has no motivation and his reputation at work is terrible. To avoid being fired, his mother's friend gives him a condition... physical service in a perverse mother-son roleplay act.
As the son continues to have sex with the owner, calling her "Mom," he begins to realize the hidden inner desire he has for his real mother. As if she could see through him, she says, "Why don't you try seducing your real mother?"