Endovascular repair of an aortic arch aneurysm has made great progress in the last 10 years. Custom-made branched stent grafts have been used, and preliminary results have been promising. To reduce the effect of aortic arch anatomical variations on indications, we designed a new off-the-shelf modular double inner branch stent-graft system. This case is the "First-in-Man" study for the device. A 74-year-old man presented with an asymptomatic saccular aneurysm and an ulcer lesion of the aortic arch. Left common carotid artery (LCCA) and left subclavian artery bypass was performed before endovascular repair. The modular stents reconstructed the innominate artery and LCCA. A follow-up on the computed tomography angiography 6-month results showed that the new device is safe and feasible for patients who are unfit for conventional surgery.