[Note to Moderators: please move this and the previous post to a new thread.]
The inscription appears to be gibberish.
A photo of another sword with the same inscription was posted on reddit four years ago
and the consensus at that time is that it made no sense -- in Chinese or in Japanese. Furthermore, one of the contributors back then noticed that five of the six characters all appear, in the same order, in the same row on this web page which provides a list of Chinese characters:
--- look at the third row below the 4 画 heading ---
suggesting that someone just randomly selected those characters in an attempt to create something that resembled Chinese or Japanese writing.