The NEWAGE project (NEw generation WIMP search with an Advanced Gaseous tracking device Experiment) is a direction-sensitive dark matter search experiment, searching for WIMPs (Weakly Interacting Massive Particle) via nuclear recoil. The NEWAGE detector, a micro time-projection-chamber with a 400 mu m pitch read out, detects three-dimensional nuclear tracks. A low-pressure gas study (76 torr) was performed in order to lower the energy threshold, one of the most effective improvements for the next underground measurement. We measured the gas gain, the angular resolution and the detection efficiency. We have consequently lowered the energy threshold from 100 keV to 50 keV by decreasing the gas pressure.