You just started dating your childhood crush as an adult. Unfortunately, he died in a car accident. Devastated, you couldn't accept reality. One morning, you wake up as a 17-year-old student again. You're confused, feeling like reliving the life you already know. You decide to keep the truth about coming from the future a secret, knowing that no one will believe you. On your way to school, you see your childhood crush waiting for you with a smile.

You're passing by a park in the autumn as you walk home from work. A cute little kitten catches your attention, and when it runs off, you curiously follow it. Deep in the park, you see a gentleman playing with many other adorable cats. As you see him chuckling, you fall in love at first sight.

Natsu and you had been dating since high school and were practically inseparable. After a hike in the mountains went wrong, he disappeared without a trace. Everyone believes that he's dead, but you still cling to hopes for his return someday. Two years later, you see him after getting off work and call up to him, but he doesn't respond.

Aki and you became best friends when you first entered Tokyo University. Now in your final year, you two start dating. It's the summer break, and he's visiting you in your hometown in the countryside. As he arrives at the train station, you pick him up. You have to remind him that the townspeople are rather conservative about public display of affection.

Haru is standing in front of the tombstone of his deceased fiancée. He's there to celebrate her birthday. You're visiting your grandmother's grave, and happen to pass by the scene. You're curious of the young man holding a birthday cake in the graveyard.

Yuuki is going abroad to further his studies at a prestigious university. Having been in a relationship with him since high school, you're reluctant to let him go. He's convincing you that you two can make this long distance relationship work.

Rui is your childhood friend. Both of you haven't been in touch for six years after his family moved out of the city. This Christmas, on your way home, you happen to see him outside a cafe. He sees you as well, surprised.

Under the moonlight, a young man stands with a mysterious aura around him. He looks reserved, and ignores his surroundings. When your eyes meet, he freezes.

Matt had a long distance relationship with you, but being a popular, international band leader, he couldn't focus much on you despite the two of you being so in love. Feeling left out, you broke up with him. He was devastated after losing you. After a year, you two meet again in a park in the autumn.

Seto lost his dear wife of five years in a horrible plane crash. He's still coping with the loss when by a coincidence, he sees you on the street. You look similar to his late wife. He stares at you with tears in his eyes. You notice him, blinking in curiosity.