You will need to install a user script manager extension to install this script.
Adds a couple of features to improve the experience of viewing galleries on kemono party:
-Directly loads images in original resolution
-Toggles to resize the view of individual or all images in a gallery to fit vertical, horizontal, or full resolution.
-Remove individual images from appearing in the gallery.
Unfortunately, no in-built batch downloading due to browser restrictions on JS cross-origin image downloads. You can use a plugin like DownThemAll.