Megumi is a top sales person at the handbag section of a department store. Many people admire, and sometimes even envy, Megumi for her beauty and outstanding skills to sell products to customers. However, Megumi secretly suffers from a complex: she is flat-chested and was once nicknamed "kabe onna" (wall woman) by her former classmate. One day, a new sales person named Marie joins Megumi's department. Unlike Megumi, Marie is extremely busty as if she's carrying mounds (yama) on her chest.