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We present the Ly$\alpha$ luminosity function (LF) derived from 34 Ly$\alpha$emitters (LAEs) at $z=7.0$ on the sky of $3.1$ deg$^2$, the largest samplecompared to those in the literature obtained at a redshift $z\gtrsim7$. The LAEsample is made by deep large-area Subaru narrowband observations conducted bythe Cosmic HydrOgen Reionization Unveiled with Subaru (CHORUS) project. The$z=7.0$ Ly$\alpha$ LF of our project is consistent with those of the previousDECam and Subaru studies at the bright and faint ends, respectively, while our$z=7.0$ Ly$\alpha$ LF has uncertainties significantly smaller than those of theprevious study results. Exploiting the small errors of our measurements, weinvestigate the shape of the faint to bright-end Ly$\alpha$ LF. We find thatthe $z=7.0$ Ly$\alpha$ LF shape can be explained by the steep slope of $\alpha\simeq -2.5$ suggested at $z=6.6$, and that there is no clear signature of abright-end excess at $z\simeq 7$ claimed by the previous work, which wasthought to be made by the ionized bubbles around bright LAEs whose Ly$\alpha$photons could easily escape from the partly neutral IGM at $z \simeq 7$. Weestimate the Ly$\alpha$ luminosity densities (LDs) with Ly$\alpha$ LFs at$z\simeq 6-8$ given by our and the previous studies, and compare the evolutionof the UV-continuum LD estimated with dropouts. The Ly$\alpha$ LD monotonicallydecreases from $z\sim 6$ to $8$, and evolves stronger than the UV-continuum LD,indicative of the Ly$\alpha$ damping wing absorption of the IGM towards theheart of the reionization epoch.

CHORUS II. Subaru/HSC Determination of the Ly$\alpha$ Luminosity Function at $z=7.0$: Constraints on Cosmic Reionization Model Parameter