At a high school entrance ceremony, high school student Kotoko Aihara (Honoka Miki), who isn't that smart, notices pretty boy Naoki Irie (Yuki Furukawa). She falls in love with him immediately. Kotoko initially doesn't express her feelings to him, but finally has a chance to tell him how she feels. Unfortunately, Naoki turns Kotoko down, saying "I don't like dumb women."One day, Kotoko Aihara's house is severely damaged by an earthquake. Until the house is rebuilt, Kotoko Aihara and her father decide to live with her father's friend. When Kotoko Aihara moves to her new temporary house, she is surprised to learn that Naoki Irie lives there as well.
Things just aren't going well for Kotoko but her luck has to change for the better soon, doesn't it?
Kotoko blackmails Irie into helping with her final exams. Kotoko's friends start wondering where she lives.
Kotoko and Irie find themselves home alone for the summer. Homework brings them unexpectedly together.
Kotoko knits a good luck charm for Irie that seems to have the opposite effect.
Kotoko is determined to make a special memory with Irie before their high school lives are over.
Kotoko and Irie begin their college life. Kotoko feels threatened when a smart and beautiful woman sets her eyes on Irie.
Kotoko and Irie are challenged to a doubles match in tennis, forcing them to work together as well as giving them a reason to see each other.
When Irie agrees to go to the movies with Matsumoto, Sudo and Kotoko secretly follow them to ruin the date.
When Naoki moves out of the house to be on his own, Kotoko tries to find a way to spend more time with him.
When the adults are away and Kotoko must rush Yuki to the hospital, Naoki is nowhere to be found.
When Kotoko, Satomi and Jinko's Christmas plans fall through, Kotoko is left home alone on Christmas Eve.
As everyone starts working towards their dreams, Kotoko feels left behind when she still remains undecided.
When Mr. Irie is admitted to the hospital, it's up to Naoki to take over the company and decide whether or not he'll give up his new-found dream to become a doctor.
When Naoki commits to an arranged marriage for the good of his father's company, Kotoko and Yuko team up to get rid of his future wife.
Kotoko decides to start dating Kin-chan, and finds herself having an unexpectedly good time. Meanwhile, Naoki prepares for his wedding with Sahoko.
Kotoko gets nervous when Naoki refuses to sign the marriage registration forms and doesn't come home for a while.
A new girl has entered Kotoko and Naoki's lives, but for once it might not be Naoki that she's interested in. A mistaken diagnoses spirals out of control and Kotoko can't handle it.
Kotoko begins nursing school, but faces new challenges with her group members. A new friend of Kotoko's isn't too fond of Naoki's treatment toward her.
As Keita pursues Kotoko, Naoki begins to act distant, making Kotoko worry that her marriage is over.
Fed up with Naoki's cold behavior, Kotoko leaves home. Kotoko's official capping ceremony approaches, making her a full-fledged nurse.
It's Kotoko's first day as an intern, but things don't go as smoothly as she planned when her patient is out to make it a very difficult two weeks for her.
When Naoki's younger cousin Rika comes to stay with the family for a bit, she proves to be another obstacle for Kotoko.
Kotoko meets a kindred spirit. Naoki gets more than he bargained for when he goes to visit Kotoko's relatives.
Yuki finds himself in a familiar situation, and must tutor a girl with a huge crush on him. Naoki passes the National Boards, but then is faced with a difficult decision.
Unable to focus in school, Kotoko travels 300 miles to see Naoki again after he gets an internship in Kobe.
Kotoko is finally a full-fledged nurse, but worries that due to her lack of experience, she'll be a burden on Naoki.
After Naoki's unassisted operation saves a life, he still must face the repercussions of the medical board for breaking the rules. Yuki and Kinnosuke both come to important realizations.
After taking a nasty fall, Naoki has the misfortune of becoming Kotoko's number one patient. Kinnosuke finally realizes his feelings for Chris, but he may be too late.
Kotoko tries to celebrate her ideal birthday with Naoki, but nothing goes as planned.