The Enju school, which produced swords in the Kikuchi area in Higo province, has certain features that are unique among Kyushu swordsmiths. 
Hiromura, who came from Yamato province, is generally known as the founder of the school. His son, Kunimura, is thought to be the founder of the style. The name of this school originated from Enju Taro, a name that Kunimura used.

HIROMURA SHO-O (f: SENJUIN SHIGEMURA, t: SHIKKAKE NORIHIRO): He lived and studied in YAMASHIRO, marrying KUNIYUKI's daughter, and brought SHIKKAKE and RAI teachings to HIGO. One of the great arguments of modern sword study wrestles the proposition of the origins of RAI. HIROMURA's father, SENJUIN SHIGEMURA is noted for his MUTSU, MOKUSA roots. RAI School changes YAKIBA style from the strong, boisterous GUNOME-CHOJI of Two-characters KUNITOSHI to the Three-characters RAI KUNITOSHI SUGUHA of SHO-O 1288, famous to the long line of students, KUNIMITSU, RYOKAI, MITSUKANE, etc. It is held that the "Coming" RAI School source is KOREAN forging techniques "coming" via MUTSU. HIROMURA and his son, KUNIMURA, were the orchestrators of ENJU. ENJU is finely worked SHIRA-KERU colored steel with a, presumed, RAI rooted CHU-SUGUHA. HIROMURA is thought to span the time frame from RAI KUNIYUKI's SHO-GEN 1259 to Three-character RAI KUNITOSHI's SHO-O 1288 SUGUHA dominance.

Ubu nakago with Kesho Yasuri and one Mekugi-ana. Thick Hira-tsukuri Tanto of Itame Hada. A Hamon pattern of medium wide Midare with Ko-Gunome figures defining the temperline. Tsuki-age Boshi.

Nobukatsu studied in Mimasaka under Tada Masatoshi and joined the Hosokawa Masayoshi school in Edo. Masayoshi was the son of Hosokawa Ryosuke of Kanuma, Shimotsuke province. After Naotane, Masayoshi was the best of the Suishinshi smiths.
Nobukatsu made swords from the last of Tenpo (1843) until the Meiji (1868); and died, Meiji 4 at the age of 75.

Five Seals NTHK Kanteisho.
Nobukatsu is listed in Toko Taikan pg.491 & Fujishiro Shinto-Hen pg.648.