It is intense, yes... :)
Higekiri and Hizamaru are sword names. They belong to Minamoto Yoritomo and Minamoto Yoshitsune respectively. There's this anime which is originally from a game called Touken Ranbu and the characters are Japanese swords in human form. It doesn't really tell much about the history, though. I'm just lucky to have a friend who's into Touken Ranbu and is deep into Japanese sword and history, so she often tells me a bunch of stuff. <3
My pleasure... :D