A hundred and several years have passed since the wall between humans and demons began to crumble. Stella, a young girl who is a descendant of the vampire’s true ancestor, is suddenly abducted by someone and when she wakes up, she is imprisoned in a prison. Stella has lost her memory of her previous girlfriend and doesn’t even know why she’s there, but when she appears outside of her cell, she’s overcome by the power of a demon who calls herself “Stella’s Familiar.” she succeeds in getting out of the cage. In order to escape from the many layers of mysterious prison, Stella runs towards the exit with her familiar.​