HEAVY METAL L-GAIM

In the Pentagona System, a young man by the name of Daba Myroad leads a rebellion against Pentagona's leader, Oldna Poseidal. Daba's not alone however, meeting a large number of allies along his journey and having in his possession the powerful L-Gaim, a white Heavy Metal left to him by his father. (Source: Anime News Network) — Description from AniList community (anilist.co).