Tsukushi Makino, a poor student, attends the elite Eitoku Academy. The F4 have free reign of the school and bully the other students. Tsukushi becomes enemies with the leader, Tsukasa Domyoji after standing up for her friend.

After abducting Tsukushi Makino, Tsukasa Domyoji asks her to become his girlfriend. Rui Hanazawa's first love Shizuka Todo returns from France. Yuriko Asai later invites Tsukushi to Shizuka's homecoming party.

Rui Hanazawa's first love Shizuka Todo makes plans to go back to France. At the airport, Tsukushi Makino encourages Rui to go after her. Meanwhile, Tsukasa Domyoji's sister Tsubaki returns from Los Angeles.

Tsukasa Domyoji and Tsukushi Makino are trapped in an elevator for a night. Someone snaps a photo of the two the next morning and the school now believes they are dating. Tsukasa does not clear up the misunderstanding.

When photos of Tsukushi Makino with a guy surface, Tsukasa Domyoji believes the photos are real and loses confidence in her. Tsukushi is determined to prove her innocence, so Sojiro Nishikado helps her investigate.

Rui Hanazawa returns from France, giving Tsukushi Makino mixed feelings. Tsukasa Domyoji's sister visits to stop their mother from interfering. Later, Tsukasa and Tsukushi go on a double date with Yuki Matsuoka and her boyfriend.

Tsukasa Domyoji feels betrayed by Rui Hanazawa, when he sees him hugging Tsukushi Makino. Tsukushi decides to go on a date with Rui. Later, Sojiro Nishikado helps Yuki Matsuoka get revenge on her cheating boyfriend.

Kaede Domyoji targets Tsukushi Makino's family and friends. Tsukushi decides to enter the Teen of Japan contest at Tsubaki Domyoji's urging. If she wins, she will get enough money to help her loved ones.

Tsukushi Makino enters Teen of Japan. Despite stiff competition from Ayano Kurimaki, she makes it to the final round. Meanwhile, Tsukasa Domyoji places a wager with his mother. He promises to go to New York if Tsukushi loses.

After not hearing from Tsukasa Domyoji for half a year, Tsukushi Makino travels to New York to see him. He gives no explanation and their relationship seems to be over. Back home, Tsukushi receives an invitation to his birthday party.

Tsukasa's mother announces her son's engagement to Shigeru Okawahara. Shigeru starts to develop feelings for Tsukasa and befriends Tsukushi Makino. The situation for Tsukushi is awkward since she still loves Tsukasa.

Tsukushi Makino plans to meet with Tsukasa Domyoji, but sees him and Shigeru Okawahara kissing. Later, Tsukasa is unable to clear up the misunderstanding with Tsukushi. She encourages him to date Shigeru, which he does.

Rui Hanazawa visits Tsukushi Makino at the hospital and confesses his feelings to her. She later moves into a new apartment, when her parents leave to work. Tsukasa Domyoji buys the whole complex.

A fight happens between Rui Hanazawa and Tsukasa Domyoji, when he tells Tsukasa that he is serious about pursuing Tsukushi Makino. Meanwhile, Tsukasa helps her brother, Susumu confess to his first love.

Tsukushi Makino moves into Tsukasa Domyoji's house, when the floor of her apartment collapses. Later, Tsukushi decides that she cannot betray Shigeru and returns the Saturn necklace to Tsukasa, who throws it in the river.

Sojiro Nishikado and Yuki Matsuoka go missing after Valentine's Day. He has been searching for his first love, and Yuki later helps him find closure. Meanwhile, Tsukushi Makino begins working as a maid at Tsukasa Domyoji's house.

In order to be with Tsukushi Makino, Tsukasa Domyoji begs Rui Hanazawa to give up pursuing her and plans to break off his engagement. Later, Kaede Domyoji returns to Japan to discuss the merger with Shigeru Okawahara's parents.

Tsukushi Makino and Tsukasa Domyoji start dating again. His mother cuts him off financially in retaliation. Later, Shigeru Okawahara's father decides to cancel the merger with Domyoji Group, causing a crisis for Japan's economy.

Tsukasa Domyoji reunites with Tsukushi Makino in a fishing village. Having hurt himself protecting Susumu, Tsukasa suffers from amnesia and has forgotten Tsukushi. Another patient Umi Nakajima starts to interfere in their relationship.

Umi Nakajima takes advantage of Tsukasa Domyoji, who is suffering from memory loss. While on a skiing trip, Tsukasa finally remembers Tsukushi Makino. Then, when she becomes lost in a snowstorm, he goes outside to save her.