"I don't want it."
Kotoko is upset when the boy that she has been in love with for 2 years refused to accept the love letter that she has written for him. This has made her the laughingstock of the school. Everyone has expected such outcome as Naoki from the A-Class would never go out with Kotoko from the F-Class. Not only he is from the A-Class, he is also a genius and a top student in school. With this rejection, Kotoko decides to move on.

Unexpectedly, during a visit from her friends, her house collapses. Her father decides to put her up at his friend's house while the house is being re-built. To her shock, "the friend" that her father has referred to is Naoki's father. Now that they are living under the same roof, Kotoko's feelings for Naoki (which has never gone away anyway...) rekindles...

This story consists of 23 volumes of manga which spans over a period of a long time, following Kotoko's and Naoki's romance, marriage and married life. However, as Miss Tada passed away before this manga is completed, the 23 volume of manga will not be completed.