Days of Memories: Junpaku no Tenshi-tachi

It takes place in a large hospital with secrets buried under its pure white exterior. Solve the mystery and discover the tragic pasts of the girls before the evil that lurks in the wings of the hospital overtakes them.

Junpaku no Tenshitachi takes place in a hospital and is a mystery-romance story. The protagonist is a patient, injured due to being trampled by a horse in the beginning.