Twenty vessels were commissioned; two more (Urumi and Murotsu) were launched by Uraga Dock and completed in August 1945 but were still uncommissioned by the war’s end.

The curved plates on the bridge were also eliminated, and the smoke stacks were made of hexagonal elements instead of with a circular or oval cross-section.

Internally, individual crew quarters were eliminated, becoming a communal area, and overall the construction was very spartan.

[2] Initially, the class retained capacity as a minesweeper, and was equipped with two paravanes; however, this was removed soon after completion.

[2] Despite being easy to build, they proved quite durable, with 11 occurrences of the class striking mines and only 3 sinking, one of which was after the war.

These included Murotsu and Urumi (both launched but incomplete); also cancelled (unstarted) were #5261, #5262, #5267 to #5284 (all of the Yaku group) from the Modified 5th Naval Armaments Supplement Programme.