Before making his manga debut with Doubt, Yoshiki Tonogai was an assistant to Soul Eater creator Atsushi Ohkubo. Tonogai followed up his hit horror series Doubt with another survival horror title called JUDGE, and has also contributed to the Higurashi When They Cry series.

Ryukishi07 leapt into the spotlight with HIGURASHI NO NAKU KORO NI which was originally conceived as a series of visual novels and later adapted into the popular manga and anime franchise.