Yuji is having no sex with his wife and can't stop feeling horny. Unable to resist, he secretly goes to a soapland, only to find that the girl who greets him is his wife's friend, Ai. Her husband's income has decreased, and she's had trouble paying off her loans, so she's started working in the sex industry. Feeling awkward, Yuji tries to change her, but she smiles and serves him to her heart's content, giving him the ultimate pleasure. More than feeling guilty about his wife, Yuji can't resist the desire to be served by Ai's body, so he goes to her again...