A-35-year-old female visited our hospital complaining of lower abdominal pain and atypical genital bleeding. A detailed examination revealed a rectal cancer with metastasis to the right ovary. Invasions to the uterus and right ureter were also detected. Three courses of XELOX therapy were administered as neoadjuvant chemotherapy. A subsequent examination revealed a significantly smaller metastatic lesion, and we therefore performed a radical resection. The pathological examination revealed that all surgical margins were negative for malignancy. We determined that there was no residual cancer and evaluated the surgery as curability A. The patient was administered XELOX therapy as adjuvant chemotherapy a month after the operation. Three months after the operation, the patient has remained in good condition with no signs or symptoms of tumor recurrence.