The music is a blend of acoustic and electronic elements, with experimental features and rhythms creating an atmospheric and alluring dark sound. The vocals and lyrics are greatly inspired by troubadourism, exploring themes of love, religion and oppression with dark humour and twisted theatricality.

The name Nikki Oniyome 鬼嫁日記 is a humouristic wink to the subtly misogynistic Japanese term "oniyome", "devil bride", which in reality is the term for women who return to work after having a baby. The name Nikki Oniyome 鬼嫁日記 stems from the Japanese comedy and TV-series Oniyome Nikki (鬼嫁日記).