Fallen Angel

Aiba Tsubasa has astounding mathematical powers. He has two younger brothers: Riku, a naive but kind-hearted university student, and Umi, who was born with a weak heart and can only be saved by an organ transplant. Their mother Takako, a gifted surgeon, abandoned Tsubasa and Riku when they were young to join a secretive medical research facility that studies people with extraordinary abilities and conducts unethical experiments to create superior humans. Umi eventually receives a successful transplant, but the donor possessed an exceptional memory and could never forget anything. As a result, Umi begins to inherit the donor’s memories, gradually being taken over by the donor’s personality. W…