A 29-year-old man was referred to our hospital with fulminant hepatic failure (FHF) and stage III hepatic coma (somnolence and confusion). Living donor liver transplantation (LDLT) was planned for 2 days after admission to our hospital. However, on the day after admission, he lapsed into stage IV hepatic coma: no right reflexes and no response to pain stimuli. Emergency cranial computed tomography revealed a subarachnoid hemorrhage (SAH), but no aneurysm was seen on magnetic resonance angiography. We speculated that the cause of the SAH may have been bleeding of intracranial veins secondary to coagulopathy and overextension of a vein due to brain edema. We considered that only LDLT could improve the coagulopathy and brain edema. The patient recovered consciousness on postoperative day (POD) 2 and was finally discharged from the hospital without neurological deficit on POD 85. This case suggested that SAH is not a prohibiting factor for LDLT in an FHF patient if the cause of the SAH is venous bleeding.