Dr. Shirai is a deranged Chronos scientist in the Guyver TV series. He has been employed by the treacherous Richard Guyot to study the Unit Remover, a device left behind by the Creators that can seperate a Guyver unit from its host.

During the destruction of Relic's Point in the episode Ray of Annihilation, Dr. Shirai tries to flee the crumbling base only to get crushed by a collapsing ceiling.