Oh, from the Mikakunin de Shinkoukei's ending.
I found some video about that with the KanMusu too :
-with Akatsuki (MMD)
-with the 6th DesDiv
-with Nagatsuki
-with Makigumo
-with Makigumo (Reupload/some part are slightly different from the first)

And a compilation of everything, including the original ending too (NicoVideo only)

Also Fenen, could you tell me how did you upload animation like this directly from the Pixiv page? Or unless you downloaded and uploaded it from your computer.

firechikara said:

Also Fenen, could you tell me how did you upload animation like this directly from the Pixiv page? Or unless you downloaded and uploaded it from your computer.

I used Gifcam and uploaded it. Very simple and works nice with things like small pixel art. Though the more frames, color, and resolution size an animation has the uglier the gif will turn out.

firechikara said:

Also Fenen, could you tell me how did you upload animation like this directly from the Pixiv page? Or unless you downloaded and uploaded it from your computer.

Check ugoira wiki - that's the new pixiv animation format, it requires some work to convert.

Type-kun said:

Check ugoira wiki - that's the new pixiv animation format, it requires some work to convert.

Thanks, I'll try giving a shot.