  Various multicellular tissues show chiral morphology. Experimental studies
have shown this can originate from cell chirality. However, no theory has been
proposed to connect the cellular chiral torque and multicellular chiral
morphogenesis. We propose a model of confluent tissue dynamics with cellular
chiral torque. We found that cells migrate unidirectionally under a gradient of
cellular chiral torque. While the migration speed varies depending on the
tissue's mechanical parameters, it is scaled solely by a structural order
parameter for liquid-to-solid transition in confluent tissues.
