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Chiral magnets have drawn a lot of attention, as their unusual magnetic structure may lead to novel transport phenomena such as the topological Hall effect. Among the chiral magnets, we focus on a class of magnetic structures whose spin configuration is characterized by multiple wave vectors (multiple-Q). Recently, such a multiple-Q ordering is found to be stabilized due to the Fermi surface properties in spin-charge coupled systems [1, 2, 3]. In this study, we explore this mechanism further, and search for a novel chiral magnetic order in the systems with strong Fermi surface instability.