Jogorou Furuya

降谷 茹五郎

He is Chihiro's grandfather, who suffers from breaks of dementia. [Spoiler] It is later revealed that he used to be professor, who was leading research about zombies alongside Darin. [/Spoiler] [Spoiler] His case of dementia is revealed to be infact due to the fact that he received multiple times the lethal dosage of the zombie venom during his days as a researcher. [/Spoiler]