The Kikuoka school (Kikuoka-) was founded in by Kikuoka Mitsuyuki (菊岡光行), a disciple of Yanagawa Naomitsu (柳川直光) of the Yokoya lineage. Born in 'en 3 (1750) in Kanda Kajimachi, Mitsuyuki trained thoroughly under the Yanagawa house and established an independent line that perpetuated the mainline tradition. His younger brother Mitsumasa (菊岡光政, 1759--1824) likewise studied under Naomitsu and became a leading kinko in his own right. The two brothers were not only influential metalworkers but also celebrated bunjin and haikai poets, both adopting the inherited literary sobriquet Senryo (沾涼) passed down from their forebears. Mitsuyuki further used the art-name Katsukenshi (活剣子) and died in Kansei 12 (1800) at the age of fifty-one. Succession passed through his son Mitsutomo (光朝) as second generation, then to Mitsushige (菊岡光重), who had originally studied under Naomitsu before being adopted into the Kikuoka house as third-generation head. Mitsutoshi (菊岡光利), son of Mitsumasa, continued the principal line into the Bakumatsu era, dying in Bunkyu 3 (1863). A further generation is represented by Unsuiken Toshinobu (雲水軒利信), a pupil of Mitsutoshi, and by Jounsai Shigeyoshi (茂義), a retained craftsman of the Takamatsu domain who studied under Mitsushige.
The collective style of the Kikuoka school is rooted in the Yokoya-Yanagawa vocabulary and characterized by what the consistently terms "precise and steadfast carving technique" (seiko kenjitsu na chogi). The canonical material treatment employs a (赤銅魚子地) ground with gold crests () and a gilt reverse ('), while are typically executed in solid gold () using rounded sculptural carving (yobori). Carving methods follow the Yokoya manner: (高彫) with colored-metal inlay (iro-e) and applied work (), producing bold, volumetric compositions. Shishi (獅子) were the pre-eminent subject -- the notes that Mitsuyuki "was especially adept at Yanagawa-style lions," whose postures "closely resemble what are termed 'Yokoya shishi' and 'Yanagawa shishi.'" Beyond lions, the repertoire embraced animals, birds, human figures, mythical beasts such as kirin (麒麟), and characteristically themes drawn from literary and theatrical culture -- mice at play with the Noh properties of Shiki Sanban, Nio guardians modeled from life at Shinagawa Hoozan -, dancing cranes, parent-and-child chickens, tigers, and auspicious early-spring imagery. Matching sets -- and -- are the school's characteristic format, frequently bearing coordinated signatures on and with split- inscriptions (wari-) on . A notable collaborative practice is attested: in one , Mitsuyuki carved the solid-gold while Mitsumasa added the and , jointly producing a work that "fully displays, without reservation, the highlights of the Kikuoka school's keen and vigorous rendering of lions."
The Kikuoka school occupies a distinguished position in the urban lineage as the direct continuation of the Yokoya-Yanagawa mainstream. The characterizes Mitsuyuki's manner as closely resembling that of Yokoya Somin (宗珉), noting that "some works display a level of skill approaching that of Somin" -- a comparison of the highest order. His depicting a raptor attacking an egret is described as "one of Kikuoka Mitsuyuki's finest works," and his solid-gold shishi is praised for its "fresh conception and forceful quality." Mitsutoshi is recognized as "an expert metalworker who took the Goto family's tradition as a model," and his shishi is lauded as making "one keenly feel the strength of the principal line of urban metal-carving, continuing from Yokoya to Yanagawa to Kikuoka." Even the rare surviving works of Toshinobu are valued for confirming the "high level of his technique" within the Kikuoka idiom. Across the corpus, the school is presented as a lineage in which technical discipline, dignified composition, and the mainline inheritance converge -- a tradition whose "precise and steadfast carving skill" is, in the 's recurrent phrase, "displayed to its fullest extent."