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We present new Atacama Large Millimeter/submillimeter Array Band 7observational results of a Lyman break galaxy at $ z=7.15 $, B14-65666 ("BigThree Dragons"), which is an object detected in [OIII] 88 $\rm{\mu m}$, [CII]158 $\rm{\mu m}$, and dust-continuum emission during the epoch of reionization.Our targets are the [NII] 122 $\rm{\mu m}$ fine-structure emission line andunderlying 120 $\rm{\mu m}$ dust continuum. The dust continuum is detected witha $ \sim $19$ \sigma $ significance. From far-infrared spectral energydistribution sampled at 90, 120, and 160 $\rm{\mu m}$, we obtaine a best-fitdust temperature of $ 40 $ K ($ 79 $ K) and an infrared luminosity of $\log_{10}(L_{\rm IR}/{\rm L}_\odot)=11.6$ ($12.1$) at the emissivity index $\beta = 2.0 $ (1.0). The [NII] 122 $\rm{\mu m}$ line is not detected. The 3$\sigma $ upper limit of the [NII] luminosity is $ 8.1 \times 10^7\ {\rmL}_\odot$. From the [NII], [OIII], and [CII] line luminosities, we use theCloudy photoionization code to estimate nebular parameters as functions ofmetallicity. If the metallicity of the galaxy is high ($ Z > 0.4\ {\rmZ}_\odot$), the ionization parameter and hydrogen density are $ \log_{10} U\simeq -2.7\pm0.1$ and $ n_\text{H} \simeq 50$-$250\ {\rm cm}^{-3}$,respectively, which are comparable to those measured in low-redshift galaxies.The nitrogen-to-oxygen abundance ratio, $\rm{N/O}$, is constrained to besub-solar. At $ Z < 0.4\ {\rm Z}_\odot$, the allowed $ U $ drasticallyincreases as the assumed metallicity decreases. For high ionization parameters,the $\rm{N/O}$ constraint becomes weak. Finally, our Cloudy models predict thelocation of B14-65666 on the BPT diagram, thereby allowing a comparison withlow-redshift galaxies.

Big Three Dragons: A [N II] 122 $\mu$m Constraint and New Dust-continuum Detection of A $z = 7.15$ Bright Lyman Break Galaxy with ALMA