Study of FYU-981 in Hyperuricemia With or Without Gout

Inclusion Criteria: * Hyperuricemic or gout patients * Serum urate level: \>= 7.0mg/dL in patients with history of gout, or \>= 8.0mg/dL in patients with hypertension, diabetes or metabolic syndrome, or \>= 9.0mg/dL Exclusion Criteria: * Gouty arthritis within two weeks before start of study treatment * Secondary hyperuricemia * HbA1c: \>= 8.4% * Uric acid-overproduction type in the classification of hyperuricemia * History of, clinically significant cardiac, hematologic and hepatic disease * Kidney calculi or clinically significant urinary calculi * eGFR: \< 30mL/min/1.73m\^2 * Systolic blood pressure: \>= 180 mmHg * Diastolic blood pressure: \>= 110 mmHg