Koga died in 2018 at the age of 81. His best known manga is the horror series Eko Eko Azarek, which ran from 1975 to 1979 in Akita Shoten’s Shonen Champion magazine and was collected into 19 volumes by Akita Shoten. Although that series was very popuar in Japan, and was adapted into live-action films, television dramas, and anime, Mansect is the first of Koga's works to be published in English.
Smudge, which is curated by manga scholar Ryan Holmberg, recently published UFO Mushroom Invasion, its second title (see “Smudge Announces New Horror/Sci-Fi Manga”).