Visual novels are interactive stories. They focus mainly on character development and plot rather than action and gameplay mechanics.
16 pixels by 16 pixels is a common resolution for assets matching a low-res pixel art aesthetic. Although the assets may not be specifically 16x16, they are designed to work in a graphical setting where objects are around that size.
Explore Visual Novel game assets tagged 16x16 and Erotic on itch.io · Upload your game assets to itch.io to have them show up here.