From the costumes, I believe these are from Pacific Rim, but there's few tags on Pixiv.

The title of the pic is 'Gensokyo Rim' so it is indeed a tribute for the movie.

Cool, thanks for the information.

Also, drifting with a ghost and a half-ghost, because why not.

From the description: It seems Youmu is remembering everything Yuyuko ate. Because Yuyuko has nothing else in her memory.