“At this age, a life without ups and downs is the happiest,” people say— and Sana has been telling herself the same thing. But as she spends her days feeling vaguely unfulfilled, her one and only joy is watching the works of the Heisei-era trending actor Kashiwagi Yamato. Tonight, she is enjoying a drama alone at home, when suddenly the man who just moved in next door barges into her house— and to her shock, he looks exactly like Kashiwagi Yamato…?! “Why is Mr. Yamato in my house…?!” “Huh? I’m Yamato’s son, Chihaya. Don’t confuse me with that old man.” This fateful encounter brings great changes to Sana’s love life and career — an adult, heart-throbbing, frustratingly sweet love story!