This　paper　introduces　a　novel　system　that　leverages　Differential　Chaos　Shift　Keying　(DCSK)　with　Orthogonal　Time-Frequency　Space　(OTFS)　technique.　Different　from　other　DCSK　systems,　the　proposed　scheme　adopts　modulation　for　both　chaotic　reference　symbols　and　information-carrying　symbols　in　the　Doppler-delay　(DD)　domain　of　OTFS.　To　mitigate　complexity　concerns,　a　low-complexity　strategy　based　on　Maximum　Ratio　Combining　(MRC)　detection　is　then　proposed.　To　assess　the　performance　of　the　OTFS-DCSK,　simulations　are　performed　using　the　Extended　Vehicular　A　channel　model　(EVA)　defined　by　the　3GPP　standard.　The　results　reveal　that　OTFS-DCSK　scheme　outperforms　the　conventional　OFDM-DCSK　in　terms　of　reliability　and　robustness　when　subjected　to　high-speed　motion　scenarios.　These　results　provide　valuable　practical　guidance,　affirming　the　effectiveness　of　our　novel　design.　　©　2023　IEEE.