The Katayama school arose when Norifusa of the Fukuoka lineage relocated to Katayama during the mid- period. While the place name "Katayama" has traditionally been identified with Province, recent scholarship has advanced the theory that it may instead refer to Katayama in the vicinity of Fukuoka in Province, inviting further investigation. Norifusa, working alongside contemporaries Sukezane and Yoshifusa, is particularly renowned for forging splendid patterns, and it is thought that the name continued across several generations given the variation in signature styles and workmanship breadth observed among extant signed works. The school is traditionally celebrated as having excelled especially at production, and many surviving works are conversions, typically showing wide with high , thin , and large .
The collective technical style of Katayama is characterized by a strong, clear showing tightly forged mixed with and occasional , with extremely fine adhering thickly throughout the surface. Fine enter well, and stands out distinctly—a consistent feature across the school's production. The displays that tends toward somewhat smaller-scale patterning than the Fukuoka group, mixing , , , and related angular elements in densely varied configurations. A defining characteristic is the tendency for the undulations to show —a reverse-slanting inclination within the temper pattern—while abundant and enter well with a fine, detailed formation. The tends to be tight with attaching, appearing bright and clear (), often accompanied by , , and effects. Many works show and occasional , creating varied and vigorous scenery. The typically shows compact ending in or slight turn-backs.
Although extant signed works are limited primarily to , the unsigned works traditionally attributed to Katayama substantiate the school's reputation through consistent manifestation of its defining traits: the tendency in the temper, the small-patterned yet densely irregular , and the well-entering fine within the . Many examples exhibit particularly vigorous and florid irregularities despite their small scale, with the displaying rich, full quality even within executions. The school's works are noted for retaining sound condition () in both and , with the bright, clear appearance of the forging and the commanding vigor of the flamboyant patterns representing enduring points of appreciation that distinguish Katayama within the broader tradition.