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Background: During the COVID-19 pandemic, safe treatment of inflammatory bowel disease is required. Granulocyte and monocyte adsorptive apheresis (GMA) has been used for therapy of steroid-dependent/refractory ulcerative colitis (UC) with few adverse events. Therefore, elucidating the effectiveness of GMA without steroids is important in the current situation. The aim of this study was to investigate the effectiveness of GMA in active UC patients who are not receiving steroids. Methods: A single-arm, open-label, and multicenter prospective clinical trial was conducted at ten facilities in Japan.UC patients who had insufficient responses to 5-aminosalicylic acid without steroids received GMA twice a week for five consecutive weeks. The primary and secondary endpoints were the induction of a response and endoscopic mucosal healing in the patients who achieved a response. Findings: A total of 67 patients were enrolled. The response rate of all patients who received GMA ten times was 58·2%. Of the 39 patients who achieved a response, 74·4% achieved endoscopically confirmed mucosal healing. Both the median Mayo score and ulcerative colitis endoscopic index of severity score were significantly decreased in the patients who achieved a response. The response rate of the patients who were suffering from their first episode was significantly higher than that of those with relapse-remitting UC (80·0% [16/20] vs. 48·9% [23/47], p=0·029). Undergoing the first episode of UC (odds ratio [OR]: 4·952, 95% confidence interval [CI]: 1·292-18·981, p>0.001) was defined as an independent predictor of a response. Interpretation: This study strongly suggest that GMA shows promising effectiveness in inducing remission in active UC patients who are not receiving steroid treatment. We expect that GMA can be made available during the COVID-19 pandemic. Trial Registration: UMIN registration No. 000013702 Funding Statement: Health and Labor Sciences Research Grants from the Ministry of Health, Labor and Welfare of Japan (Investigation and Research for intractable Inflammatory Bowel Disease to HN). Declaration of Interests: MM reports personal fees from Janssen Pharmaceutical K.K., and commercial research funding from AbbVie GK. and Nippon Kayaku Co., Ltd. SN reports receiving personal fees from EA Pharma Co., Ltd., AbbVie GK., Mitsubishi Tanabe Pharma Corporation, Janssen Pharmaceutical K.K., Mochida Pharmaceutical Co., Ltd., Takeda Pharmaceutical Co., Ltd. KH reports receiving research funding from EA Pharma Co., Ltd., Mitsubishi Tanabe Pharma Corporation, Takeda Pharmaceutical Co., Ltd. HN reports receiving personal fees from AbbVie GK., Kissei Pharmaceutical Co., Ltd., Kyorin Pharmaceutical Co., Ltd., Mitsubishi Tanabe Pharma Corporation, Janssen Pharmaceutical K.K., Takeda Pharmaceutical Co., Ltd., Pfizer Lnc., Cell gene Corporation., EA Pharma Co., Ltd., Zeria Pharmaceutical CO., Ltd., Mochida Pharmaceutical Co., Ltd., Nippon Kayaku Co., Ltd., Daiichi Sankyo Company, Limited., JIMRO Co., Ltd., as well as grants for commissioned/joint research from Hoya Group Pentax Medical, Boehringer Ingelheim GmbH, Bristol-Myers Squibb Company. All other authors declare no competing interests. Ethics Approval Statement: The protocol of the clinical trial was approved by the IRB at each institution. Informed consent to participate in the study was obtained from each participant before inclusion.