Yahagi is the second of her class, after Noshiro, to obtain her second remodel on March 31, 2021, although her getting a second remodel had already been known before Noshiro's through a series of trailers for the second Kantai Collection anime, starting with the one shown at the Kancolle Jazz Concert Festival in 2019.
Yahagi has two second remodels, Kai Ni and Kai Ni Tei (2B). Yahagi's Kai Ni form is almost identical to Noshiro's: She switches to a new serafuku consisting of a black pleated skirt, a black dress shirt worn under a long-sleeved sailor shirt with a black sailor collar, and a black stylized necktie, as well as exchanging her red scrunchie for a white one. She also wears a pair of black thighhighs. She differs from Noshiro by having her shirt partially open from the bottom and draped over her skirt rather than tucked in, her sleeves stopping mid-forearm rather than at the wrist, allowing her to keep her gloves, and only one set of garter straps is holding her left thighhigh as opposed to both.
In her Kai Ni Tei form, she switches to a white dress shirt worn under a mostly open long-sleeved black sailor shirt (black sailor collar being kept) and the necktie is now orange. She also eliminates her right thighhigh, similar to her base form. This Kai Ni Tei form is what was apparently shown in the said trailers.
