It's a story about two people who live next door to each other but never meet because one of them always only turns left and the other one always only turns right.
One day they meet by a pond and they have such a good time together. At the end of the day, it starts to rain so they say goodbye and leave each other their number. When they get home, they realize the piece of paper which has the number has been ruined by the rain.
They miss each other a lot. And they both try to find each other but never do. They still don't know they are actually next door neighbors and keep missing each other. She still always goes to the left, and he still always goes to the right.
They are both very sad. The winter is here, which makes the city cold and gloomed. They both decide to leave the city.She still goes to the left, and he still goes to the right.

They finally run into each other again by the pond.
For me the story is not necessarily a love story at all. I think it tells us that by staying in our comfort zone and repeating our habitual pattern we're missing a lot of things happening around us.