We propose a theory of chiral fermion dark matter (DM) with an isospin-3/2 sector $SU(2)_D$ gauge symmetry, which is arguably the simplest theory. An isospin-3 scalar breaks down to discrete non-Abelian group $T'$ and generates DM mass. The symmetry protects mass guarantees its stability. derive consistency conditions for study phenomenology. In some regions parameters two-component scenario re...