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We present Keck spectroscopic observations of three probable high redshiftsuperluminous supernovae (SLSNe) from the Subaru HIgh-Z sUpernova CAmpaign(SHIZUCA), confirming redshifts of 1.851, 1.965 and 2.399. The host galaxieswere selected for transient monitoring from multi-band photometric redshifts.The supernovae are detected during their rise, and the classically scheduledspectra are collected near maximum light. The restframe far-ultraviolet(FUV;$\sim$1000A-2500A) spectra include a significant host galaxy fluxcontribution and we compare our host galaxy subtracted spectra to UV-luminousSNe from the literature. While the signal-to-noise ratios of the spectrapresented here are sufficient for redshift confirmation, supernovaspectroscopic type confirmation remains inconclusive. The success of the firstSHIZUCA Keck spectroscopic follow-up program demonstrates that campaigns suchas SHIZUCA are capable of identifying high redshift SLSNe with sufficientaccuracy, speed and depth for rapid, well-cadenced and informative follow-up.

First release of high-redshift superluminous supernovae from the Subaru HIgh-Z sUpernova CAmpaign (SHIZUCA). II. Spectroscopic properties