The primary armament of the "Kii" class was ten 45-caliber guns in five twin-gun turrets, two fore and three aft of the superstructure. This gun fired a shell at a muzzle velocity of . The secondary battery consisted of 16 single 50-caliber guns was mounted in casemates in the superstructure. The manually operated guns had a maximum range of at an elevation of +35° and fired at a rate up to 10 rounds per minute. The ships' anti-aircraft defenses consisted of four single 45-caliber 10th Year Type anti-aircraft guns mounted around the single funnel. Each of these guns had a maximum elevation of +75° and a maximum rate of fire of 10–11 rounds per minute. They could fire a projectile with a muzzle velocity of to a maximum height of . The "Kii" class was also fitted with eight above-water torpedo tubes, four on each broadside.