The "UD" stands for . In the context of Japanese typography, this is a massive deal. Universal Design fonts are created with accessibility as the priority. They are engineered to be legible by as many people as possible, including the elderly, those with low vision, and people reading on low-resolution screens.
: Platforms like Fontke and Online Fonts provide downloads for the TTC (TrueType Collection) or TTF files, though users should exercise caution with third-party sites regarding licensing. Ud Digi Kyokasho Nk-b Font Download