[2] She started by drawing doujinshi in her spare time and selling them at Comiket under the pen name Odile Kuronuma.
Kojima's work schedule slowed during the 2010s, though she returned to the Castlevania series for the 2019 mobile title Grimoire of Souls.
[5] Kojima stated she could "only offer a small amount of time" for the project, and illustrated the packaging artwork for physical copies given to certain Kickstarter backers.
[6] Kojima's style is influenced by classical artists such as Francisco de Goya and Caravaggio, as well as works of science fiction and horror.
[3] Media which Kojima has often employed in paintings include the use of molding paste, Conté Crayon, acrylics, India ink, gloss polymer medium, stumps and finger smudging.