Do you think of someone when you see a rainy day? No matter when and where, the drizzle will remind you of that person. Only you know the story with that person. No matter what the story is, it must be extraordinary. Maybe what you want to say to that person can be found in the rain, and maybe it can be expressed for you in the rain. If that person doesn't know yet, let that person know that it's already raining here. This is the greeting of "rain".
This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.