Heavy remodelling of the Tenryuu-class Kuma-class First set of the 5500 ton series

Built with a hangar and an aircraft platform placed in a forward superstructure below the bridge. (Eventually refitted with a catapult.) Upgraded from 53cm to 61cm torpedoes! Nagara-class Second set of the 5500 ton series.

Third set of the 5500 ton series! Fitted with oil and coal fed boilers to combat fuel shortages. This class had 4 funnels due to her design of their boilers. Sendai-class