Ken has an encyclopedic knowledge of modern medicine, but his body has been frail and failing since birth. After an accident leaves him locked inside his own body, his parents decide to end his life support… or so it should have ended.

Instead, a goddess transfers his mind to a body immune to illness and casts him into a world consumed by plague and death. Surely this is where he will finally save lives with his knowledge… or so he thought.

Now he is stuck with two flame-wielding sisters, Kaguya and Karin, who wish to experiment on him. His grand medical adventure has begun… but can he keep up with two hot-headed siblings, or will he melt under the pressure?