Goodbye You, It's Still the Rainy Season

This book tells the story of the protagonist who lost his best friend, the heroine, in his childhood. In an accident in college, the hero accidentally traveled to a strange world, and recalled the words the heroine said during his lifetime - Thirteen. Now I go to another world, and I will wait for you to come to me in the other world. The hero started a new adventure. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.