Mochizuki General Hospital is famous not only for its highly skilled nurses — but also for their striking beauty. By day, these women dedicate themselves to battling sickness and saving lives. But when night falls, their mission takes a far darker turn. Led by the hospital’s enigmatic chairman, a select group of staff members — joined by a few daring local teens — secretly take up arms as mercenary assassins. Their goal: to hunt down the "cancers" of society and eliminate them before their corruption can spread. A story where white coats are traded for blood-stained weapons, and the real fight begins after hours.