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In this work we investigate the sensitivity to the neutrino mass hierarchy,the octant of the mixing angle $\theta_{23}$ and the CP phase $\delta_{CP}$ inthe future long-baseline experiments T2HK and DUNE as well as in theatmospheric neutrino observation at Hyperkamiokande (HK). We show for the firsttime that the sensitivity is enhanced greatly if we combine these threeexperiments. Our results show that the hierarchy sensitivity of both T2HK andHK are limited due to the presence of parameter degeneracy. But this degeneracyis removed when T2HK and HK are added together. With T2HK+HK (DUNE), theneutrino mass hierarchy can be determined at least at $ 5 \sigma$ (8 $\sigma$)C.L. for any value of true $\delta_{CP}$. With T2HK+HK+DUNE the significance ofthe mass hierarchy increases to almost 15 $\sigma$ for the unfavorable value of$\delta_{CP}$. For these combined setup, octant can be resolved except$43.5^\circ < \theta_{23} < 48^\circ$ at $5\sigma$ C.L for both the hierarchiesirrespective of the value of $\delta_{CP}$. The significance of CP violation isaround 10 $\sigma$ C.L. for $\delta_{CP} \sim \pm 90^\circ$. Apart from thatthese combined facility has the capability to discover CP violation for atleast $68\%$ fraction of the true $\delta_{CP}$ values at $5 \sigma$ for anyvalue of true $\theta_{23}$. We also find that, with combination of all thesethree, the precision of $\Delta m^2_{{\rm eff}}$, $\sin^2\theta_{23}$ and$\delta_{CP}$ becomes 0.3%, 2% and 20% respectively. We also clarify how theoctant degeneracy occurs in the HK atmospheric neutrino experiment.

Complementarity Between Hyperkamiokande and DUNE in Determining Neutrino Oscillation Parameters