The heroine traveled through time and became a tree. As a tree, she witnessed various stories that I thought of (it mainly depends on what I dreamed the night before).
Also:
Shu does not participate in the development of the story, except for being chopped down branches for firewood, used for hanging, etc., And it can grow anywhere, but it cannot be moved wherever it grows in each chapter until the end of the story.
As for how Shu went to other places... I am far away...
The heroine in my mind is the absolute bystander, the bitch girl!