Ok, what?

Oh, I always thought it's Reimu (because hair color) or Sumireko (because surname). Never seen people thought its Sakuya

Definitely one of the more random... theory, if that is what this is. Like I can't think of one connection between Sakuya and Renko to come up with this.

Valentine322 said:

Definitely one of the more random... theory, if that is what this is. Like I can't think of one connection between Sakuya and Renko to come up with this.

Actually, there’s one: TIME.

Renko has the abilities to know what time it is by looking at the stars, and Can know her location by looking at the moon.

Sakuya May be a “sharpshooter” with her knives, but her main ability is to stop time with her watch soo she can move more freely, and can attack better.

find out more info about that "theory" and it's has something to do witha series the artist did back in 2016: https://www.pixiv.net/en/artworks/55261903 (the series has 8 episodes, and it's connected to another series from the same artist that is 31 pictures long... 34 counting 3 solo images the author did too...)