A combination of wide-field infrared and spectroscopic surveys provides valuable, large samples of infrared-detected galaxies without ambiguity in projection along the line of sight. These samples are an important basis for studying the optical/infrared properties of infrared bright galaxies and their environmental dependence. In this regard, we have been conducting an MMT/Hectospec spectroscopic survey of AKARI 9 micron selected galaxies in the North Ecliptic Pole Wide field (NEP-Wide), covering a 5.4 deg^2 region of the northern sky, to study the star formation and nuclear activity of dusty galaxies and its environmental dependence at intermediate redshifts (z < 0.6). We report the current progress of the survey and preview the data from this survey.