The story centers on a girl who is told she only has six months to live. In the spring of her first year of high school, she confessed to a boy who is in the same class, even though it's their first time meeting. The two gradually grow closer as lovers, and on her birthday, they go to see the 'Strawberry Moon', which is said to be a time when you will be forever bound to the person you love if you watch it together.
Min Su, a playboy who believes there's no true love, can't stand long-term relationships. However, the fate takes him to a dazzling beauty, Hye Won, who just escaped from the boring hospital. She leaves a strong impression on Min Su. Again, chased by a nurse, as Hye Won sneaks into the men's room at the hospital, their 2nd encounter is made. And Min Su gets totally captivated by this bold lady, although Hye Won tries to resist him worrying that their love might expire soon due to her terminal disease.
Miyu and Shuya are high school students. They have dated for 2 years. Miyu and Shuya have a promise that no matter what, they will watch a movie together on the first day of each new month. When Miyu and Shuya are on their way to the movie theater, Shuya suddenly cancels their date. Shuya seems like he is hiding something and he acts nervous. Later, Miyu goes to the place where she is supposed to meet Shuya, but she witnesses Shuya getting into a car accident. She panics, but when she wakes up she finds herself on the morning of the accident. Miyu keeps waking up on the day when Shuya got into an accident.
