The hospital was built by the Haibara Family to study and treat Getsuyuu Syndrome, using a combination of modern medicine and traditional spiritual remedies. Attached to the hospital by a connecting corridor was Rougetsu Hall, a more luxurious sanatorium, and both buildings were staffed by the same personnel. In 1970 the hospital was managed by Shigeto Haibara, who used his role to carry out illegal experiments on patients, usually in secret rooms. Medical records were burned in the incinerator in the backyard.