Night Shift Nurses is the North American localization of Yakin Byoutou(夜勤病棟Yakin Byoutou), a Japanese OVA series adapted from the visual novel of the same name by Discovery. It was translated by Lighthouse Productions, licensed by Central Park Media and distributed in the United States by Critical Mass Video. The series is particularly notorious for its explicit depictions of rape, sadomasochism and paraphilia.