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Observations of transient objects, such as short gamma-ray bursts (GRBs) andelectromagnetic counterparts of gravitational wave sources, require promptspectroscopy. To carry out prompt spectroscopy, we developed an optical-fiberintegral field unit (IFU) and connected it with an existing opticalspectrograph KOOLS. KOOLS with IFU, hereafter KOOLS--IFU, was mounted on theOkayama Astrophysical Observatory 188-cm telescope. The fiber core and claddingdiameters of the fiber bundle are 100 $\mu$m and 125 $\mu$m, respectively, and127 fibers are hexagonally close-packed in the sleeve of the two-dimensional(2D) fiber array. We conducted test observations to measure the KOOLS--IFUperformance and obtained the following conclusions: (1) the spatial sampling is2''.34 $\pm$ 0''.05 per fiber, and the total field of view (FoV) is 30''.4$\pm$ 0''.65 with 127 fibers; (2) the observable wavelength and the spectralresolving power of the grisms of KOOLS are 4030--7310 A and 400--600;5020--8830 A and 600--900; 4160--6000 A and 1000--1200; and 6150--7930 A and1800--2400, respectively; and (3) the estimated limiting magnitude is18.2--18.7 AB mag during 30-min exposure under the optimal condition.

KOOLS--IFU: Kyoto Okayama Optical Low-dispersion Spectrograph with Optical-Fiber Integral Field Unit