Super Robot manga series by Ishikawa Ken and Nagai Gou. Known for pioneering the concept of combining robots in the mecha genre.
The following tags implicate this tag: apocrypha_getter_robo_darkness, getter_robo_(1st_series), getter_robo_arc, getter_robo_daikessen!, getter_robo_devolution, getter_robo_g, getter_robo_go, moe_getter_robo, new_getter_robo, shin_getter_robo, and shin_getter_robo_vs_neo_getter_robo (learn more).