55-year-old Haga Chitose. A full-time housewife married for 28 years with two children, she leads an ordinary daily life. However, she is actually a trilingual returnee fluent in English and Italian. Before marriage, she worked as an in-house interpreter at a major corporation, utilizing her language skills. Her husband is a Japanese man employed at the company's overseas branch, and due to their lifestyle of constantly traveling between Japan and abroad, she has felt a quiet loneliness. Amid this, she secretly had a boyfriend, but after parting ways with a man she had dated for 15 years, she found no new romance and began harboring fantasies about free-sex relationships. Yet, it wasn't until now, at the age of 55, that she finally resolved to step forward and embark on a new journey.