takanami kai ni (swimsuit mode) (kancolle)
The bikini official alternate costume of Kantai Collection's Takanami Kai Ni, as seen in post #4681883.
Her kai ni-exclusive swimsuit consists of a black bikini, brown skirt with a floral print, brown straw hat, sandals, thigh straps holding a mix of torpedoes and AA guns, and her usual funnel rigging.
This tag implicates takanami_kai_ni_(kancolle) (learn more).