Eimi, a female college student, decides to work as a nursing care volunteer at an elderly couple's house.However, there was a room in this house that the door should never be opened... It was too late when I noticed the abnormality of this house where there were signs of people other than the elderly couple.Eimi is attacked by someone and dragged into the room in question.Eimi's abnormal confinement communal life, which gradually becomes aware of the modern darkness that will begin from now on, "Kodooji".