  Here we report a resonant x-ray diffraction (RXD) study at the Cu L3 edge on
the multi-chiral system CsCuCl3, exhibiting helical magnetic order in a chiral
crystal structure. RXD is a powerful technique to disentangle electronic
degrees of freedom due to its sensitivity to electric monopoles (charge),
magnetic dipoles (spin), and electric quadrupoles (orbital). We characterize
electric quadrupole moments around Cu ascribed to the unoccupied Cu 3d orbital,
whose quantization axis is off the basal plane. Detailed investigation of
magnetic reflections reveals additional sinusoidal modulations along the
principal axis superimposed on the reported helical structure, i.e., a
longitudinal conical (helical-butterfly) structure. The out-of-plane
modulations imply significant spin-orbit interaction despite S = 1/2 of Cu2+.
