Driven by a hopeful dream in Tokyo but facing harsh realities—part-time jobs and a hesitant girlfriend—Yuta finds his life unexpectedly upended. When his older brother Makoto arrives to stay at home with his wife Nao in tow,
Yuta is instantly captivated by Nao. He becomes determined to shield her and deliver the happiness she deserves. During moments when Makoto is away from home base,
Yuta enjoys a blissful companionship with Nao. Though he knows this secret affair carries significant risk should Makoto discover their closeness,
he remains blissfully unconcerned. However, Nao seems deeply aware of the danger lurking around them. In a selfless act of protection for Yuta’s fragile happiness and safety, she makes the difficult choice to leave both Yuta and Makoto behind.