Mitsumori has, since old times, been transmitted as a swordsmith of the school, active around the Shoo era (1288--1293) during the late period. The do not make his lineage clearly known; however, when one examines extant signed works, their brilliant -- in which is especially conspicuous -- readily suggests affiliation with the Moriie line, and there are points of correspondence in the manner of signing. The has noted that his technical skill was quite accomplished and that he may have been a substitute craftsman for his teacher Moroie, though his characters differ from those of Moroie. Extant works bearing his signature are extremely few, making his blades quite rare; as representative examples, a transmitted in the Hotta family and a with an transmitted in the Akimoto family -- both designated Important Art Objects -- are consistently cited across his designation records.
Mitsumori's work is defined by a flamboyant and ornate style. The typically shows mixed with , at times tending toward , with extremely fine adhering thickly and entering well. A vivid stands out across the surface. The takes as its principal motif, incorporating , -, , , and in varying combinations -- forging a wide and tempering a of deep and splendid character. Within the tempered edge, and enter profusely, producing a complex and varied character; adheres in a -dominant manner, with fine and running through and mingling along the . The is consistently described as bright and clear. His signature, when present, is rendered in a large, strongly individual hand, cut with a somewhat fine chisel -- a manner described as typical for this smith.
The repeatedly affirms that Mitsumori's works exhibit "a splendid and ornate style" and demonstrate "an excellent level of workmanship." Blades attributed to him are praised for good -- well-retained flesh -- and for the manner in which diverse elements produce "numerous points of connoisseurship." The overall aspect of his hardened edge is consistently connected to that seen in the signed reference works, while individual pieces are noted as "still richer in variation," conveying "a sense of openness and vigor." Given the extreme rarity of his surviving oeuvre, the has observed that each signed example "merits particular attention" and is "precious as reference material." Mitsumori occupies a distinguished position within the lineage as a smith of accomplished skill whose flamboyant , brilliant , and richly varied place him firmly within the grand tradition of late craftsmanship.