What kind of animation is this? Where can I watch it?

Character: Agata Katsuhira

The picture is as follows:

Web page: Right-click the picture and select "Open in a new tab" to view a larger image.

If the picture is blocked, non-anonymous users should check the private message (webpage: upper right; APP: message-private message)

Or send me a private message with the address of the question, otherwise no one will know what you are talking about (no address of the question, no questioner will reply).

Please adopt it in time, thank you!