Hong Meiling Sleepwalks Through the Heavens

The protagonist transmigrates into Hong Meiling from Touhou Project and unexpectedly discovers that she has gained a new ability: while sleeping, she can travel through dreams to other real worlds.

So Meiling goes from one world to another, encountering people, making friends, and leaving her mark. As she travels through these worlds, she steadily grows stronger. In some of them, she eventually comes to be hailed as a legend.

Meanwhile, back in Gensokyo, Meiling takes part in many major events and gradually grows more and more popular, becoming someone everyone loves and admires.