Ishiyumi's works often have some sort of theme that carries over even into the language. In the Banshee series, it's "to cry", including multiple variations of the word (scream, wail, etc.), in both senses of meaning. For Hawkeye, it's sight, seeing and eyes. For Kougetsu... it's "heart".

This makes the translation somewhat tricky to pull off, but it's worthwhile doing it.