The hidden tip is in the frequency distribution analysis of the ciphered text.

This is the frequency distribution plot of the text:


If we sort it by the frequency of the text's letters, we can see an anomaly:


The letters "E", "n", "N", "S", "e", "i", "I" and "T" have all been repeated 42 times.

Sorting these letters by their ASCII number gives us the string "EINSTein".

Original writeup (https://github.com/Hu13er/XeroCTF/blob/master/komorebi/README.md).