Saori is a struggling manga artist living in modern-day Tokyo, trying to find her place in the creative industry while also navigating her personal life. Her world turns upside down when she meets Tony, an American linguist and language geek who moved to Japan out of a deep fascination with the Japanese language. Despite their obvious cultural differences, they begin a relationship and eventually decide to marry, leading to a series of humorous and eye-opening situations.

The central conflict of the story arises from the everyday communication gaps between Saori and Tony. Saoro finds herself constantly fielding bizarre and hyper-specific questions about her native tongue, leaving her to wonder whether these strange queries stem from his background as a foreigner or from his peculiar obsession with linguistics. Tony is portrayed as a charismatic but slightly airheaded intellectual, while Saori is more grounded and temperamental, leading to a push-and-pull dynamic as they learn to coexist. A major narrative arc follows Saori as she travels to the United States to meet Tony's family, where she struggles with cultural norms foreign to her, such as the operation of a taxi door that does not open automatically like in Japan.

As the relationship progresses, the film shifts from a light comedy about cultural quirks into a more dramatic examination of commitment and understanding. The couple faces significant pressure regarding their future, including the logistical and emotional stress of planning an international wedding. A key supporting scene involves Saori's sister's wedding ceremony, where the real-life Tony Laszlo, the actual American husband of manga creator Saori Oguri, makes a cameo appearance as the priest. The real Saori Oguri also appears briefly as a relative of the bride at this wedding. The narrative tension stems not from a lack of love, but from the constant exhaustion of translating not just words, but entire worldviews, forcing both partners to decide if their relationship can survive the relentless effort required to bridge two very different cultures.