Familiar-of-zero Stories

In the Western Army's Defeat in the Battle of Sekigahara, a force of 150 men has their backs against the wall and is being dwindled and assaulted in every direction. As each of his retainers and ashigarus fell down one by one it is Hiraga Shinsuke's turn to die by the sword. As he was kicked down and awaiting his honorable death his eyes saw light and was transported in a new realm he doesn't know of. How will he cope with his new master and the continent of Halkeginia?