Japanese Sister? Chinese Brother? so Sci-Fi?

This book is based on the background of the animation "Dandelion in the Castle Town", combined with "Your Name", "Chainsaw Man", "JoJo's Bizarre Adventure", "Minecraft Story Mode", "The Wandering Earth 2", "Invincible Young Heroes" and many other works. It will tell the story of two people who have never met before - Li Moran, a boy from country C, and Akane Sakurada, a girl from country R. Please see the preface for the disclaimer (if the male protagonist's name coincides with the names of some real people, it is purely coincidental, and let me just say that the protagonist's name cannot be changed...)