The July 2022 issue of Futabasha’s Monthly Action magazine has announced that manga creator Koko Natsuki passed away on April 18, 2022. The cause of death was not revealed in the announcement.
Natsuki launched the Yaruna yo Yaruna yo Zettai Yaruna yo Kotori-chan manga in Monthly Action in 2018, and ended it in 2020. She debuted the Usotsuki wa Imōto no Hajimari manga in Futabasha’s Comic High! magazine, and the series transferred to Monthly Action after the magazine ended publication.
Natsuki launched the Marriage Royale manga in 2007 and the Tantei Opera Milky Holmes: On Stage! manga in 2011.