Usagi Masashi was a Hare Clan Emerald Magistrate and one of Usagi Ozaki's many nephews. Since 1157 he served as the Hare emissary to Shiro Shinjo, where his clan maintained an embassy. Masashi built a network of friends and informants since his assignment, as part of his mission to keep tabs on any possible Kolat or Bloodspeaker activity within Unicorn Clan lands.