Just Another Guinea Pig (Uma Musume Pretty Derby)

Just Another Guinea Pig (Uma Musume Pretty Derby) is a doujinshi starring Agnes Digital from Uma Musume Pretty Derby, by Cafin and available in english.

From here you can explore more Uma Musume Pretty Derby content, other entries featuring Agnes Digital and more works by Cafin. You might also enjoy Tagai ni Kasoku suru Kodou (Uma Musume Pretty Derby).