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Makino Tsukushi, a working-class girl, attends an elite escalator school called Eitoku Academy (英徳学園, Eitoku Gakuen?), populated by children from rich, high-society families. She is the "weed" of the school, surrounded by all the rich kids, including the "Flower" Four (F4). The F4 leader and son of the wealthiest, most powerful family in Japan, Domyouji Tsukasa, takes an interest in Tsukushi, because she is the only girl at Eitoku who doesn't fawn over him. However, his hot-headed nature and bullying ways are originally a major turn-off for Tsukushi, who has her sights set on someone else.

The violinist Rui Hanazawa, Tsukasa's best friend, becomes Tsukushi's first serious romantic interest. He is a quiet and cold guy, but he has a soft spot for his close friend and Tsukushi's idol, the model Todo Shizuka, whom he harbored feelings for since childhood. His character is a bit complex, and always has changing feelings for Tsukushi, but above all cares about her in a friendly way.

The other two members of the F4 are Mimasaka Akira, the laid-back peacemaker of the group, and Nishikado Sōjirō, an unrepentant playboy. They both usually have at least one girlfriend at any one time; Akira prefers older women because the women of his household (his mother and two younger sisters) are quite silly. Sojiro is happy to be in casual relationships with many women, although we later discover that at one time he was in love with a childhood friend.

A live-action adaptation of the manga began airing on Fuji TV on April 15, 2008 and ran for eleven episodes until its conclusion on June 24, 2008. In the live-action version, Riiko Izawa is an office lady in search of a boyfriend, and she ends up in possession of a "robot" known as Night Tenjo, who is programmed to be the perfect boyfriend. However, this creates a love triangle with a distinguished young man at her company who also has feelings for her. Riiko is played by Saki Aibu, Night is played by Mokomichi Hayami, and Soshi Asamoto is played by Hiro Mizushima.

Choi Han Kyul, played by Gong Yoo, is the cocky son of a rich family who runs a food corporation. He doesn't believe in love and certainly doesn't want to get married despite his family's requests. On the other hand, Go Eun Chan, played by Yoon Eun Hye, is a 24-year old tomboyish female who gets mistaken as a guy quite often. She takes up every job possible - waitress, food deliverer, etc - and has the responsibility of taking care of her mother and younger sister. Eun Chan accidentally meets Han Kyul twice, once on a delivery and once during a robbery. During the robbery, Eun Chan's delivery motorcycle ends up being damaged. Han Kyul, not knowing that Eun Chan is actually a girl, decides to hire Eun Chan as a false "lover" so that he can escape the blind dates arranged by his grandmother. Meanwhile, Han Kyul's cousin, Choi Han Seong, is an established music producer and his ex-girlfriend Han Yoo Joo, who Han Kyul secretly loved for nine years, is a famous artist who studied in New York. The two were lovers for about 8 years but their relationship ended when Yoo Joo broke up with Han Seong. Two years after they separated their paths cross again when Yoo Joo returns to Seoul.

After getting an ultimatum from his grandmother, Han Kyul takes over a run-down old coffee shop, later renamed Coffee Prince, to prove his ability, both to his grandmother and Yoo Joo. In order to attract female customers, he only hires good looking male employees. In a struggle with money, Eun Chan, whom Han Kyul has already mistaken as a boy, hides her gender identity to get a job at Coffee Prince. Soon feelings start to spark between Eun Chan and Han Kyul. Because he's unaware that Eun Chan is a girl, Han Kyul starts to question his sexuality.