"A few years ago, back when my Lord Mifune was alive, I had a strange adventure. If the people I met are to be believed, I traveled in time to the future of my world. They gave me this weapon and while this weapon saved my life, I hid it. It's destructive power unleashed in my world would be terrible. I can not allow that. Would you take it from me? I understand this is a terrible burden but if such exists on your world already, it is not as large a burden as it is in mine."