This image is a composite: It is composed of different, smaller ones put together in the correct way to make a bigger and coherent picture.

This depiction of Sakuya Izayoi is the cover of a CD album called "Offensive Algorithm", published by the circle "South of Heaven", which contains song arrangements of Sakuya's themes. The album was originally released for Comiket 95 (30/12/2018), and the illustration was drawn by "clear".

PLEASE NOTE: I am not the artist of this depiction. The only credit I have is compiling this image from smaller images, which were particular frames in a XFD video that shows fractions of the music in the album.
The album cover was released with low resolution (827x828) and with 2 logos that hide the clock tower and Sakuya's thighs, both of which are absent in my composite. I just thought that it was very unfortunate that the artist never published a proper version in high resolution without the logos. In my eyes, it was a figurative "war crime" to not have that "uncensored" masterpiece, so here it is.
This composite, however, is incomplete in the sides compared to the source image, but at least now I can see Sakuya's entire body without a logo on top and the big clock in the background.

*EXTERNAL LINKS*

1. Offensive Algorithm CD album cover (drawn by "clear") (archived in danbooru): danbooru.donmai.us/posts/34982…

2. Offensive Algorithm XFD video in Youtube (from which I got the frames to make the composite without the logos present in the original album cover): www.youtube.com/watch?v=arjFlP…

3. Extended XFD audio in SoundCloud (longer than the Youtube version): soundcloud.com/south-of-heaven…

4. The album was at one point for sale by South of Heaven in Booth: s-o-h.booth.pm/items/1962878
However, at the time of this post, it is out of stock. I would like to purchase it just for the cover. But alas, it appears it is not possible for now.

5. Please visit clear's pixiv page if you liked his art style: www.pixiv.net/en/users/1840049
Or his Twitter profile: twitter.com/clear_LO_

In danbooru, "clear" is tagged as "kuria_(clear_trip_second)". Danbooru has archived a selection of his illustrations: danbooru.donmai.us/posts?tags=…

6. South of Heaven circle official webpage: s-o-h.com/