"I accept this promise from you, but keep it safe."
Of course, the title of the book is deceiving. How could I let the protagonist wait until the end of the world? I haven't been able to imagine the story of two old people =_=.
This is how two people met and got to know each other online. I have been joking around, but suddenly I realized that I like you. No, it's too unreliable. Goodbye forever.
Then, I accidentally discovered that you are still there. I'm not leaving this time…