The Japanese Project K8, No.13-class Submarine Chasers were built as a part of the Maru 4 Programme. The lead ship of her class was completed in July 1940, while the last ship was completed in January 1942, with a total of 15 vessels built. During WW2, most of the vessels of the class were re-armed with 25 mm Type 96 guns and fitted with 22-GO radar. They fought primarily in the southern seas, from the Philippines to Bali Island, but also participated in numerous convoy escorts. Only five vessels of the class survived the war.

The Type K-8 No.13 late is a Japanese sub-chaser introduced in Update 1.89 "Imperial Navy". She has exceptional survivability combined with very good armament for her BR. She struggles most in mobility, which is not helped by being a comparatively large vessel for the BR, making her a very attractive target to motor torpedo boats and enemy bombers alike. Compared to her predecessor, she improves on survivability and armament, at the expense of significantly lower speed and manoeuvrability.