Saotome Institute, which is the center of Getter Ray study, was attacked by a mysterious monster. That figure was a huge "Oni", which is a legendary monster. They fought with a prototype Getter Robo against it. However, they noticed a big fault. Manipulating Getter Robo was a burden to the pilot, and the normal person couldn’t stand it. To provide for the next attack, they had to look for the candidates for the pilots.

A mysterious monster called the High Beast, has taken control of the regions of Eurasia and Africa. Japan has cut off from the mainland to protect itself from this threat. The daughter of a legendary mahjong player discovers that monsters attack whenever a mahjong piece is hit across the board. This allows humans to be separated from the battle and for mahjong players to effectively combat the monsters with robots controlled through mahjong moves

After Emperor Gore and the Reptilian empire is defeated, a new enemy, Emperor Burai and his Hyakki empire rises and threatens to take over Earth. Ryoma, Hayato, and newcomer Benkei pilot the new Getter Robo G to save Earth.
(Source: ANN)

A Mercedes-Benz SLR car ad by Go Nagai featuring Devilman.

(Source: MU)