Nakai, an auditor from an insurance company, is used to being glared at by the people from his line of work, so when his neighbor Takahashi smiles at him, he is pleasantly surprised. That doesn't last long, though, as it turns out that Takahashi is the assigned salesperson that Nakai needs to deal with on behalf of a client, and moreover, Takahashi hates auditors like Nakai. What will happen to these neighbors whose professions are like oil and water?