In the war-torn solar system of Pentagona, the immortal ruler Oldna Poseidal governs with an iron fist in the year 3990. Daba Myroad, a lone survivor of the decimated Yaman Clan, resides on the isolated planet Koam with his companion Mirao Kyao. Armed with the legendary humanoid mecha, L-Gaim, a relic of his vanquished clan, Daba crosses paths with Fanneria Amu, an aspiring actress, and Lilith Fau, the sole surviving fairy in Pentagona. Pursued by thieves coveting L-Gaim, Daba and his allies forge a pact with the dying wish of one of their assailants. This vow propels them into the orbit of the formidable merchant Amandara Kamandara, setting them on a collision course with daunting adversaries and entwining them in a rebellion against the despotic rule of Poseidal.