A Dimensional Journey Starting from Gensokyo

I was accidentally selected by Dream Space. Originally, my mission was to collect the origins of the world and upgrade the dream space into a complete world. However, when I completed the task, I found that something seemed wrong. Looking at the new world formed by the dream space, and the girl's door that looks like the warblers and swallows living in it, I seem to have made something wrong. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.