[i][[Kantai Collection]][/i] character [[personification|personifying]] the second of the 67 [i]Tei[/i]-class (or D-class) coastal defense ships ([i]kaibōkan[/i]), all of which were never formally named. She refers to herself through a goroawase nickname, Yotsu (よつ), sometimes spelled Yottsu (よっつ).

Her class was designated with even numbers while the C or [i]Hei[/i] class (which numbered 53) were dubbed with odd numbers. Both classes were built as simplified versions of the [i][[Ukuru (kancolle)|]][/i]-class due to Japan's deteriorating war situation; they also had similar designs. The [i]Tei[/i]-class was given turbine engines due to the lack of diesel engines that were given to the [i]Hei[/i]-class.

Yotsu has [[long_hair|long]] [[brown hair]] that is tied into [[low twintails]] but with [[hair rings]] at the ends and [[brown eyes]]. She wears a [[white headwear|white]] [[sailor hat]], a [[white dress|white]] [[sailor dress]] with a [[blue_sailor_collar|blue]] [[sailor collar]], blue accents, and a [[yellow bow]], [[white_legwear|white]] [[socks]], and a pair of [[uwabaki]]. Pinned to her left chest is a [[searchlight]]. Her [[machinery]] basically consists of a miniature version of her namesake ship slung to her left like a bag, an [[adapted turret]], and several [[depth charge]]s, one around each thigh and several in a canister near her person.

Despite being known only by a number, the historical escort ship made some contributions to Japan's war effort, having sunk two American submarines, USS [i][[Scamp_(kancolle)|]][/i] on November 11, 1944 and USS [i]Swordfish[/i] on January 4, 1945, although evidence for the latter is unclear. She was sunk by Royal Navy aircraft at Toba on July 28, 1945 and later salvaged and scrapped on June 30, 1948.
よつ 第四号海防艦(艦隊これくしょん) 第四号海防艦(艦これ) 第四号海防艦 四号海防艦