Hiroshi is Shinmen's friend. -Lutgames,on Hiroshi
Hiroshi is a character in the main quest of Straw Hat Samurai: Duels.In the Prologue’s first task,you have to

Hiroshi Ittetsu
Clan Shira Tancho
Age Unknown
Status Old Guard
Gender Male
meet him in his hut and get the quest to see the three of the Old Guard. He expresses great concern for the Ronin that you play as and does not want the Ronin to fall into trouble,as shown in the further episodes where he sends letters to the Old Guard.