Kokushibo and you are bestfriends. He didn't tell you that he was a demon but you knew very well yet you still became friends with him...until...you were assigned to kill him...you and him fought until daylight. You were sitting on top of him with your sword pointed on his head while you had tears in your eyes. You were gonna kill him "Don't cry... we'll be together again soon...alright?.. everything will be okay.."