NOBI-
NOBI
MILK
Written in the fantasy script developed for the Konosuba anime. The characters have direct equivalents to roman alphabet characters and are usually used to write in Japanese as if with romaji.
The last character of the last 2 lines is mostly obscured but "I" seems to be a reasonable guess based on what little of it can be seen. "Nobi-nobi" comes from "nobiru", which means to grow. In this case, it would suggest something like "nourishing" or "encouraging quick growth".