The Fujishima school was a group of swordsmiths based in Kaga Province. Documentary tradition transmits that they were disciples of Rai Kunitoshi, with Tomoshige regarded as the school's founder. Some sources alternatively place the lineage within the Sanekage line. While the school's activity is said to extend from the end of the Kamakura period well into the early modern era, the earliest firmly dated works bear nengō from the Ōei era, and the NBTHK has noted that no extant pieces can be confidently attributed to before the Nanbokuchō period.
Fujishima works characteristically display a jigane with a dark, somewhat blackish tone, in which ko-itame mixed with nagare-hada produces a distinctly northern-provinces flavor. In hamon, the school shows considerable range: some blades present a fine suguha with hotsure and hakikake in the bōshi, evoking a Yamato-like sensibility, while others are tempered in gunome-midare incorporating togariba, hako-gakatta elements, and yahazu-ba, with well-formed nie and vigorous sunagashi. The latter mode, with its tendency toward connected undulations and prominent ashi, is recognized as especially representative of contemporaneous "Hokuriku-mono" -- the distinctive manner of the northern provinces. Shirake-utsuri may also appear.
Designated works encompass tachi, wakizashi, and naginata, demonstrating the school's versatility across blade forms. The naginata in particular, with their ubu-nakago preserving full original tang proportions, provide important evidence for dating the group's activity. Pieces from the early Muromachi period onward exhibit elements that are at once Bizen-like and Mino-like, and it is this composite character -- drawing upon multiple traditions while maintaining a distinctive regional identity -- that defines the Fujishima group's particular scholarly interest.