A young man named Nanba Masato is an aspiring writer. One day, he feels sharp pain in his stomach and rushes into a hospital. There, Okouchi Yoko, a doctor in a white lab coat, comes in to treat him. Despite the severe pain, it helps Masato to feel a little better since Yoko cares for him like a sweet Venus. After successful surgery, Masato is hospitalized for a while. He is actually glad to be looked after by Yoko. But he never knew this was just the very beginning of the road to despair and destruction.

Various strange things happen one after another at the hospital. A mysterious note is found in a back of a drawer in a sickroom. A medical accident of an elderly woman with dementia occurs. A girl is in near-death condition by an unknown allergy. A patient's condition worsens by a false medical records… You can't help but wonder, are these really just accidents?