The malice wears a white robe beside you…

A priest says “devil is like dust, nobody notices it creeps into your mind.” Yoko Okouchi, a woman with beautiful appearance, is listening to the priest. She wears a neutral expression on her face.

Masato Nanba wishes to be a writer. He feels sharp pain in his stomach and rushes in a hospital. Yoko is the doctor who treats him. Masato has been suffering from the pain, but he feels a little bit better because Yoko cheers him up very kindly like a Venus.
Masato has a successful surgical operation and stay in the hospital for a while. He is actually glad to be looked after by Yoko
But it is the entrance of the road to despair and destruction.

Many strange things happen in the hospital. A mysterious note is found in a back of a drawer in a sickroom. A medical accident for an old woman of dementia occurs. A girl is about to die by unknown allergy. A patient gets worse by a false medical records. And so on.
Are these really just accidents?