ゲッターロボ飛焔 ~THE EARTH SUICIDE~

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) Note: Includes an extra chapter that was published on the last volume.