He was asked to be made only after the Shinsengumi earned popularity and Kondo noted that they should have better weapons to maintain their charisma. While Kondo resolved to find a Kotetsu for himself, Hijikata seeked for a Kanesada. He did find a swordsmith from Kanesada school, and asked to be made a tachi which had similar characteristics to his wakizashi (Horikawa). This might be the reason Izumi and Horikawa looked similar to each other.
One theory goes that Izuminokami wasn't used during Hijikata's last battle in Hakodate, but instead got sent back to his hometown along with a photo taken there a few days before the battle. The one Hijikata used is a sword made by Sukesada of Bizen Osafune school.
He was mentioned in a letter Kondo sent to his hometown on 1863. It is not known if Hijikata had 2 Kanesada swords althought the possiblity he had 2 swords are not high. 
Originally classed in game as a Tachi until 2015/07/22