Three young pilots connected by the Getter Rays (Ryoma Nagare, Hayato Jin, and Musashi Tomoe) are recruited by Dr. Saotome to fight the Devolved beings appearing from spatial distortions using the only weapon that can face these monsters, the Getter Robo.

The first Getter Robo series chronologically. Published 15 years before the rest of the manga, Getter Robo pioneered the idea of the combining and transforming robot.
Millions of years ago, the dinosaurs were driven deep underground due to the sudden arrival of "Getter Rays" on Earth. After evolving into sentient beings, they grew bitter and vengeful at the humans who replaced them on the surface and began plotting their attack on humanity.
Fighting against them is Getter Robo, a machine built by Professor Saotome which uses the mysterious Getter Rays as its power source. Piloting it are three strong-willed young men - the violent martial artist Nagare Ryoma, the psychopathic yet highly intelligent revolutionary Jin Hayato, and the hot-blooded Judo master Tomoe Musashi. Each controls one of three specially designed combat jets which can be combined together in different forms to form three different kinds of giant robots: the flying, axe-wielding Getter-1, the quick, drill-wielding Getter-2, and the tough, tank-like Getter-3.

Set in a post-Apocalyptic Earth, Hayato Jin continues to lead the Saotome Research Institute after the events of Getter Robo Go. He has succeeded Professor Saotome's masterpiece prototype, the Shin Getter Robo, with a more stable creation: Getter Robo ā?.

Crossover one-shot between Mazinkaiser and Shin Getter Robo. It was included in Immortal Super Robot Encyclopedia (不滅のスーパー? ボット大全).

The manga begins with the Mazinger Z and Great Mazinger fighting against an alien machine after the Diana A and Venus A have been taken down.

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This series continues the Ken Ishikawa continuity of Getter manga, temporally taking place after Getter Robo Go and before Getter Āḥ. The series features an older Hayato leading a new team of Getter Pilots (and a new Getter) as they defend the earth from large plant-like monsters.
(Source: Wikipedia)

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

Manga adaptation of the anime Cutie Honey done by Ken Ishikawa and Yuu Okazaki, it follows more the anime and the character design is closer than the original one.

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.

Prequel to the Getter Robo Armageddon anime.

Also published in the Getter Saga version of Shin Getter Robo.

These are different stories involving Devilman's world. Some are about Devilman and add to the mythology some are separate stories that don't involve Devilman but take place the same time as the events in the original Devilman manga. They are illustrated by various artists. There are some color pages in the start middle and toward the end. There are some truly amazing art and stories in these volumes.

Number one is written and illustrated by Lazy Hagawari, Tatsuya Egawa, Katsuya Terada, Ken Ishikawa, Go Nagai and Shinichi Hiromoto.

Number two is written and illustrated by Hitoshi Iwaaki, Noriko Nagano, Go Nagai, Akihiko Takadera and Kazuko Yumeno.

Number three is written and illustrated by Noburu Miyama, Miki Toro, Shinobu Kaze, Sho-u Tajima, Masaomi Kanzaki, Yoshikazu Yasuhiko and Iou Kuroda.