The F4 are the rulers of the elite school, Eitoku Academy. Tsukushi Makino, a so-called "commoner," gets on the bad side of their leader, Tsukasa Domyoji, when she protects Makiko Endo.
The fall term at Eitoku Academy that Tsukushi has been dreading starts. In contrast, Tsukasa gets there early in order to perform a childish prank on her.
Tsukushi attends Shizuka's birthday party with Kazuya and Yuki Matsuoka. There Shizuka makes the announcement that she will be giving up her family name in order to become a lawyer in France.
Concerned for Rui, Tsukushi begs Shizuka to stay in Japan. Shizuka clearly explains her reasons for leaving. Rui overhears the conversation and becomes angry.
Thomas turns out to be the childhood friend of Sakurako Sanjo. He promises to keep their night a secret if she sees him again. Meanwhile, Tsukushi helps Sakurako with her fear of boys by introducing her to the F4.
Sakurako reveals that she has a crush on Tsukasa, leading Tsukushi to finally admit that she is not actually dating him. The next day, a photo of Thomas and Tsukushi is posted at school.
At school, Tsukushi attacked by her classmates. Tsukasa attempts to step in, but Sakurako stops him by showing him the photo of Tsukushi and Thomas. Tsukushi begs him to believe that nothing happened.
Eventually, Tsukasa rescues Tsukushi from her classmates. He takes her to his house, where she has a bath. After he treats her wounds, Tsukasa confesses her feelings to her and kisses her.
When Rui comes back from France, Tsukasa tells him that he and Tsukushi are dating. Rui later flippantly asks her if she will go out with him. Meanwhile, Sakurako is being bullied after the others discover an old photo of her.
Tsukasa drags Tsukushi on a trip to the F4's annual trip to his family's island. There he acts if they are really a couple. Tsukushi, however, remains fixated on Rui. That night, when she thinks Tsukasa is asleep,Tsukushi goes for a walk.
Rui tells Tsukushi about his time in Paris. When she returns to the villa, she lies to Tsukasa by telling him she was alone. He later finds out the truth. The next night, Tsukushi returns to beach now crying.
Tsukasa catches Tsukushi and Rui kissing. Back at school, he kicks Rui out of the F4 in a public fight. Tsukushi, who feels horrible for hurting Tsukasa, tries to apologize to him but he walks pass her.
Tsukushi meets Rui for their date. She thinks about Tsukasa throughout much of it, wondering how he would have handle certain mishaps. Rui invites her back to his house, where he quickly falls asleep.
After seeing Tsukasa with Sakurako, Tsukushi meets his sister Tsubaki Domyoji, who brings her to their house. Tsukushi manages to hide but gets lost in the huge mansion. He comes across her and becomes angry when she mentions Rui's name.
Tsukasa declares that he will have Tsukushi and Rui expelled from school. He blackmails the principal by threatening to pull his family's funding. His sister storms into the office. She suggests they settle the matter through sports.
Before the match, Tsukasa promises to call it off if Tsukushi says she loves him. She remains silent, rejecting him. Rui's team is losing badly when he comes up with a new tactic to gain points.
Tsubaki has Tsukushi and Rui locked in a room after learning that have not slept together. Rui reveals to Tsukushi that he is not over Shizuka. Tsukasa, meanwhile, wanders around thinking of Tsukushi before going home.
After Tsukasa promises to loan her the money, Tsukushi makes her way to Canada with the rest of the F4 and Yuki. Yuriko and her friends tag along as well. Later, a jealous Yuriko lies to Tsukushi by saying she saw Yuki go outside.
Tsukasa runs outside to save Tsukushi. He carries her to a deserted cabin, where they spend the night in one another's arms. The next day, Tsukasa attempts to confess his feelings to her.
After returning home, Tsukushi feels awkward around Tsukasa. She later meets Junpei Oribe, a freshman at Eitoku. He reminds her a bit of herself. Junpei offers his hand in friendship and reveals his secret by dragging her to a photo shoot
A photo of Tsukushi and Junpei makes the cover of a magazine. Tsukasa becomes angry, which leads to him beating up Junpei. He confesses his feelings to Tsukushi again, but she does not answer him.
Tsukushi is kidnapped by Junpei and his partners. He reveals to her that he has a grudge on Tsukasa and is using her to lure him there. Tsukasa arrives after receiving a note for him to "come alone."
Tsukushi wakes up in the hospital. The F4 play a trick on her by pretending Tsukasa has died. Tsukushi breaks down crying and admits to Tsukasa about how scared she was of him really dying.
Tsukasa invites Tsukushi to his birthday party. Before entering the party, Sojiro reveals that Tsukasa's mother, Kaede, will judge her as a potential fiance. Tsukushi becomes nervous and attempts to leave, but ends up staying.
The F4 try to lie to Kaede about Tsukushi's background, leading Kaede to test her. She ends up confronting her son, who openly admits his feelings for Tsukushi. His sister makes an opening for the couple to escape.
Kaede decides to implement her plans for Tsukasa earlier than expected. Meanwhile, Tsukushi and Tsukasa are spending the night on his family's yacht. She gives him his birthday present.
Tsubaki becomes more and more worried about her mother's plans for her brother. Meanwhile, Tsukushi has decided to break up with Tsukasa after talking to Yuki. Nishida arrives shortly and brings her to Kaede.
When Tsukasa storms out of the hotel, he grabs Shigeru by accident. This leads Tsukushi to think that they are already dating. Tsukasa attempts to explain himself to her but to no avail.
Shigeru decides to pursue Tsukasa romantically. She confides in Tsukushi about wanting to fall in love. By mistake, Tsukushi ends up agreeing to help her with Tsukasa.
When Tsukushi breaks things off with Tsukasa, he wonders whether it is time to give up. Later, Sojiro and Akira take Shigeru on a date in an attempt to get her away from Tsukasa, which fails miserably.
Tsukushi pretends to be happy about Shigeru and Tsukasa dating. She decides to take it as a new start, but has a hard time forgetting Tsukasa with Shigeru constantly asking for advice.
Tsukushi continues to pretend that she is okay. As a distraction, she throws herself into her job. One night, she stops for some tea after meeting Rui by chance. There they run into Tsukasa and Shigeru on a date
At Shigeru's villa, Tsukushi feels awkward around Tsukasa. She later passes out the bath while thinking of the whole situation. Rui ends up saving her and takes her to a room that they have to share.
Tsukushi finds comforts in Rui by holding his hand. At the same time, Shigeru does not react well after learning that Tsukasa still has feelings for Tsukushi. She causes a lot of noise that alerts Tsukushi, who goes to check on her.
Tsukushi learns that her family is moving to a fishing village and leaving her behind. On top of this, she still has to contend with her feelings though she stubbornly tries to ignore them.
Now on her own, Tsukushi is settling into her new life though she finds herself a little lonely without her family. Luckily, her friends are all there to cheer her up and help redecorate her apartment.
In a surprise move, Shigeru transfers to Eitoku so that she can be closer to Tsukasa. Tsukushi feels sad about it, realizing that she will have to see the couple together every day now.
Rui reconciles with Shizuka and decides to return to France. Seeing him change makes Tsukushi want to as well. She enters Eitoku's exchange student program.
After Tsukushi passes the exam for the exchange program, Tsukasa learns that his mother arranged it all to separate them. He tells Tsukushi and explains what really happened with Shigeru.
Tsukushi is unable to find Tsukasa at school. She and their friends head to his house, where he is being held forcibly. Tsukushi confronts Kaede about her fear of losing control of her son.
