A love story about two step-siblings, Yota and Kaoru. Long ago, Yota's mother married Kaoru's jazz-playing father, effectively merging the two families. Unfortunately, Kaoru's father skipped town, and Yota's mother passed away, but not before imparting a dying wish to her young son to take care of Kaoru.

In 1923, teenager Kim Shun-Pei moves from Cheju Island, in South Korea, to Osaka, in Japan. Along the years, he becomes a cruel, greedy and violent man and builds a factory of kamaboko, processed seafood products, in his poor Korean-Japanese community exploiting his employees.

Sachiko is an university student. Her nickname is Buko, because she has been negative about everything since she was young. Sachiko believes someday she will meet a man like in a romance manga. Her university life is boring and she spends her time reading romance manga in her room. One day, on Twitter, she meets a man who uses the user ID of Sparrow. He likes reading manga and looks like Johnny Depp. Sachiko makes a date to meet the man. She tries to change herself, but it's not so easy due to various unexpected incidents.

Yui Kotani, a second-year junior high school student, is obsessed with men's underarm hair. Her classmate Masato Takeo has the thickest underarm hair in the class.